Add-PSSnapin Microsoft.SharePoint.PowerShell

# Replace siteurl with actual web url
$web = Get-SPWeb -Identity "siteurl"
# Replace docurl with document library url
$list = $web.GetList("docurl")

function DeleteFiles {
    param($folderUrl)
    $folder = $web.GetFolder($folderUrl)
    foreach ($file in $folder.Files) {
        # Delete file by deleting parent SPListItem
        Write-Host("DELETED FILE: " + $file.name)
        $list.Items.DeleteItemById($file.Item.Id)
    }
}

# Delete root files
DeleteFiles($list.RootFolder.Url)

# Delete files in folders
foreach ($folder in $list.Folders) {
    DeleteFiles($folder.Url)
}

# Delete folders
foreach ($folder in $list.Folders) {
    try {
        Write-Host("DELETED FOLDER: " + $folder.name)
        $list.Folders.DeleteItemById($folder.ID)
    }
    catch {
        # Deletion of parent folder already deleted this folder
    }
}

Like the documents in a document library, attachments are stored in Blob form in the content database

You can use Sharepoint Designer to access your Sharepoint Site, there are the Document Librarys and the documents you upload.

 Hhigh enough permission level you can select the document, go over the ribbon to files and click "Discard Check Out"

The stickyHeaders widget as part of the Sharepoint List .

_spBodyOnLoadFunctionNames.push("stickyHeaders");

function stickyHeaders() {//-----------------------------------------------------------------------------------------------------------------------------------------------
//Class
function List () {
this.list               = "";
this.webpart            = "";
this.sticky             = "";
this.header             = "";
this.dphm               = "";
this.s4                 = "";
this.contentBox = "";
this.top_old            = 0;
this.top_new            = 0;
this.bottom_old         = 0;
this.bottom_new         = 0;
this.wpBottomBorder_old = 0;
this.wpBottomBorder_new = 0;
this.wpTopBorder_old    = 0;
this.wpTopBorder_new    = 0;
this.wpScrollPos_old    = 0;
this.wpScrollPos_new    = 0;
this.prevHeight         = 0;
this.permsWithAnon      = 0;
this.fixedHeight        = 0;
this.fixedWidth         = 0;
this.widthChange        = true;
this.setWidth = function() {
if(this.widthChange){
if(this.fixedWidth) {
//TODO
//$(this.sticky).css("overflow-x","hidden")
//$(this.sticky).width($(this.sticky).closest("[id^=WebPartWPQ][style*=width]").width() - 18).children().each(function (j) {
// $(this.header).css("min-width",$(this.header).children('*:nth-child(' + (j+1) + ')').width())
//});
} else {
this.sticky.width(this.header.width());
for(var k=0, childrenLength = this.sticky.children().length; k<childrenLength; k++){
this.sticky.children().eq(k).width( this.header.children().eq(k).width() ).css("max-width","");
}
}
this.widthChange = false;
}
};
this.setLeftOffset = function() {
var parent = this.webpart.length != 0 ? this.webpart : this.dphm;
this.sticky.css("left",(parent.offset().left + parseInt(parent.css("padding-left")) - 2) + "px");
};
this.setTopPosition = function() {
if( !this.fixedHeight ){
this.sticky.css("top", (this.s4.offset().top + 2));
} else {
this.sticky.css("top",this.webpart.offset().top + "px")
if(this.sticky.attr('data-hidden', false) && this.sticky.offset().top < (this.s4.offset().top + 2)){
this.sticky.css("top", (this.s4.offset().top + 2));
}
}
};
this.update = function(eventType) {
if(this.sticky.attr('data-hidden', false)){
this.setLeftOffset();
this.setTopPosition();
}
if(eventType == "scrollList"){
this.wpScrollPos_old = this.wpScrollPos_new
this.wpScrollPos_new = this.webpart.scrollTop()

if(this.wpScrollPos_old <= this.prevHeight && this.wpScrollPos_new >= this.prevHeight ){
this.contentBox = this.list.find(".ms-core-menu-box")
this.contentBox.appendTo(this.sticky.find("th").eq(this.contentBox.closest("th").index()))
this.setWidth()
this.sticky.fadeIn().addClass("typeA");

} else if(this.wpScrollPos_old >= this.prevHeight && this.wpScrollPos_new <= this.prevHeight ) {
if(!this.sticky.hasClass("typeB")){
this.sticky.fadeOut().removeClass("typeA");
} else {
this.contentBox = this.sticky.find(".ms-core-menu-box")
this.contentBox.appendTo(this.header.find("th").eq(this.contentBox.closest("th").index())).css({"top":"auto","left":"auto"})
this.sticky.removeClass("typeA")
}
}
} else {
this.top_old = this.top_new;
this.top_new = this.header.offset().top - this.s4.offset().top;

this.bottom_old = this.bottom_new;
this.bottom_new = this.top_new - 30 + this.list.height();

if(this.fixedHeight) {
this.wpTopBorder_old = this.wpTopBorder_new;
this.wpTopBorder_new = this.webpart.parent().offset().top - this.s4.offset().top;
this.wpBottomBorder_old = this.wpBottomBorder_new
this.wpBottomBorder_new = this.webpart.parent().offset().top + parseInt(this.webpart.css("height")) - this.s4.offset().top
} 

//fix for the permission this.when anonymous access is activated
this.bottom_new = this.permsWithAnon ? this.top_new - 30 + this.dphm.height() : this.bottom_new

this.bottom_old         = !this.bottom_old         ? this.bottom_new         : this.bottom_old;
this.top_old            = !this.top_old            ? this.top_new            : this.top_old;
this.wpBottomBorder_old = !this.wpBottomBorder_old ? this.wpBottomBorder_new : this.wpBottomBorder_old;
this.wpTopBorder_old    = !this.wpTopBorder_old    ? this.wpTopBorder_new    : this.wpTopBorder_old;

if (this.top_old >= 0 && this.top_new <= 0 || this.bottom_old <= 0 && this.bottom_new >= 0 || this.fixedHeight && ( this.wpBottomBorder_old <= 0 && this.wpBottomBorder_new >= 0 || this.wpTopBorder_old >= 0 && this.wpTopBorder_new <= 0 ) || ( this.top_old == this.top_new && this.bottom_old == this.bottom_new && this.top_old < 0 && this.bottom_old > 0 )) {
this.contentBox = this.list.find(".ms-core-menu-box")
if(this.contentBox){
this.contentBox.appendTo(this.sticky.find("th").eq(this.contentBox.closest("th").index()))
}
this.setWidth()
this.sticky.fadeIn().addClass("typeB")

} else if (this.top_old <= 0 && this.top_new >= 0 || this.bottom_old >= 0 && this.bottom_new <= 0 || this.fixedHeight && ( this.wpBottomBorder_old >= 0 && this.wpBottomBorder_new <= 0 || this.wpTopBorder_old <= 0 && this.wpTopBorder_new >= 0 )){
this.contentBox = this.sticky.find(".ms-core-menu-box")
this.contentBox.appendTo(this.header.find("th").eq(this.contentBox.closest("th").index())).css({"top":"auto","left":"auto"})
if(!this.sticky.hasClass("typeA")){
this.sticky.fadeOut().removeClass("typeB");
} 
if(this.sticky.hasClass("typeA")){
if(this.wpBottomBorder_new <= 0){
this.sticky.removeClass("typeB").fadeOut();
} else {
this.sticky.removeClass("typeB")
}
}
}
}
}
}

(function (){
var wpq = $("#DeltaPlaceHolderMain [id^=MSOZoneCell_WebPartWPQ]:visible");
if (wpq.length === 1) {
function ShowContextRibbonSections() {
SP.Ribbon.WebPartComponent.registerWithPageManager({editable: true, isEditMode: false, allowWebPartAdder: false});
var wpcomp = SP.Ribbon.WebPartComponent.get_instance();
if (wpcomp) {
wpcomp.selectWebPart(document.getElementById(wpq.attr('id')), true);
}
}

ExecuteOrDelayUntilScriptLoaded(ShowContextRibbonSections, "sp.ribbon.js");
var DeselectAllWPItems_old = DeselectAllWPItems;
DeselectAllWPItems = function () {
DeselectAllWPItems_old();
setTimeout(function () { ShowContextRibbonSections(); }, 25);
};
}

var RibbonContainer = $("#RibbonContainer")
var ribbonHeight = RibbonContainer.height();
g_workspaceResizedHandlers.push(function () {
setTimeout(function () {
var newRibbonHeight = RibbonContainer.height();
if (ribbonHeight !== newRibbonHeight) {
findListsOnPage(false);
ribbonHeight = newRibbonHeight;
}
}, 500);
});

if (jQuery.inArray("spgantt.js", g_spPreFetchKeys) > -1) {
SP.SOD.executeOrDelayUntilScriptLoaded(function () {
setTimeout(function () { findListsOnPage(false); }, 500);
}, "spgantt.js");
} else {
findListsOnPage(false);
}

$(window).bind('hashchange.stickyHeaders', function () {
findListsOnPage(true);
});
})()

function findListsOnPage(hashchange) {
window['listContainer'] = {"lists":[]}

var quickEdit = false;

$("tr:has(>th[class^='ms-vh']):not(.sticky):visible, .ms-listviewgrid").closest("table").each(function(){
if($(this).find("tbody > tr").length > 1){
listContainer.lists.push(new List());
listContainer.lists[listContainer.lists.length - 1].list = $(this);
if($(this).hasClass('.ms-listviewgrid')){
quickEdit = true;
}
}
})

if (quickEdit) {
SP.GanttControl.WaitForGanttCreation(function () {
setTimeout(function () {
initializeStickyHeaders(listContainer,hashchange);
}, 1000);
return;
});
} else {
setTimeout(function(){initializeStickyHeaders(listContainer,hashchange);},0)

}
}

function initializeStickyHeaders(container,hashchange) {
$(window).unbind('resize.stickyHeaders');
$(window).bind ('resize.stickyHeaders', function () { $(container.lists).each(function(){this.update("resize")}) });

$('#s4-workspace').unbind('scroll.stickyHeaders');
$('#s4-workspace').bind('scroll.stickyHeaders', function () { $(container.lists).each(function(){this.update("scroll")}) });

$(container.lists).each(function(){
this.webpart        = this.list.closest("[id^=WebPartWPQ]")
this.header         = this.list.find("tr:has(>th):not(.sticky):visible")
this.dphm           = this.list.closest("#DeltaPlaceHolderMain");
this.s4             = $("#s4-workspace")
this.permsWithAnon  = this.list.closest("div[id$='rptrAnony__div']").length;
this.fixedHeight    = this.list.closest("[id^=WebPartWPQ][style*=height]").length;
this.fixedWidth     = this.list.closest("[id^=WebPartWPQ][style*=width]").length;

var prevElem = this.header.closest("table").prevAll()
for(var i=0, prevElemLength = prevElem.length;i<prevElemLength;i++){
this.prevHeight = this.prevHeight + $(prevElem[i]).outerHeight()
}

if(this.fixedHeight || this.fixedWidth){
this.webpart.bind("scroll",{elem:this}, function(event){
event.data.elem.update("scrollList")
})
}

if (!this.webpart.find(".sticky").length) {
this.list.before('<div class="sticky-anchor"><span></span></div>');
this.sticky = this.header.clone(true, true).addClass("sticky").attr('style', "position: fixed; border: 1px solid grey; background-color: white; box-shadow: 0 0 6px -2px black; display: none;").insertAfter(this.list);
this.sticky.find("#users_imn_header").attr("src", "/_layouts/15/images/imnhdr.gif")
this.sticky.find(".ms-selectall-span img").on("click",{header:this.header},function (event) {
var span = event.data.header.find(".ms-selectall-span")
span[0].checked = span[0].checked ? false : true;
ToggleAllItems2(span[0], span.attr("id").substr(17), span[0].checked)
});
} else {
if(hashchange){
this.sticky = this.list.closest("div").find(".sticky");
/*
var childrenLength = $(this.header).children().length
for(k=0; k<childrenLength; k++){
if(!this.header.children().eq(k).find(".ms-filter-iconouter").attr('data-hidden')){
this.header.children().eq(k).find(".ms-filter-iconouter").css("display","inline-block")
} else {
this.header.children().eq(k).find(".ms-filter-iconouter").css("display","none")
}
if(!this.header.children().eq(k).find(".ms-sortarrowdown-iconouter").attr('data-hidden')){
this.header.children().eq(k).find(".ms-sortarrowdown-iconouter").css("display","inline-block")
} else {
this.header.children().eq(k).find(".ms-sortarrowdown-iconouter").css("display","none")
}
}
*/
} else {
this.sticky = this.list.closest("div").find(".sticky");
}
}

//update stickies when grouped views are expanded or collapsed
this.list.children("tbody[id^='titl']").find(".ms-gb a").bind('click.stickyHeaders',{elem:this},function (event) {
var elem = event.data.elem
elem.widthChange = true
interval = setInterval(function(){
if($("#tbod" + $(event.target).closest("tbody").attr("id").substr(4) + "_").attr("isloaded") == "true"){
elem.update("expandCollapse");
clearInterval(interval);
}  
},1)
});
});
$(container.lists).each(function(){this.update("standard")})
}

(function () {
$("<div/>", {html: '&shy;<style>.sticky .ms-core-menu-box {top: auto !important; left: auto !important;}</style>'}).appendTo("body");
})();
}