Deleting Multiple Items from Library Doesn't Work

I've been trying to delete the massive amount of art from my library for a few days now. However, it appears I can't do more than 30 items at once. When I'm trying to delete 300MB at once, this is a really tedious job when going 30 items at a time. I can load my entire library at once by scrolling until I reach the end, and I can even select all of it, but deleting it doesn't do anything. It's all there when I refresh and my storage usage doesn't go down. Surely there's a better way to do this. I've disabled all my add-ons/extensions, just to be sure, as well. 

Looking at the console when I attempted to delete more than 30 items, I do notice an error: 

v2.js?1519751058:1 Mixed Content: The page at 'https://marketplace.roll20.net/library' was loaded over HTTPS, but requested an insecure image 'http://app.roll20.net/js/textboxlist/close.gif'. This content should also be served over HTTPS.
_ @ v2.js?1519751058:1
css @ v2.js?1519751058:2
Ce @ v2.js?1519751058:2
E @ v2.js?1519751058:1
hide @ v2.js?1519751058:2
Z.fn.(anonymous function) @ v2.js?1519751058:3
stopEditing @ browse.js?1452029248:552
initialize @ browse.js?1452029248:488
e.View @ v2.js?1519751058:6
I.n @ v2.js?1519751058:6
(anonymous) @ yourlibrary.js?v=31:65
each @ v2.js?1519751058:1
each @ v2.js?1519751058:1
callback @ yourlibrary.js?v=31:63
a @ v2.js?1519751058:15
u @ v2.js?1519751058:2
fireWith @ v2.js?1519751058:2
i @ v2.js?1519751058:3
(anonymous) @ v2.js?1519751058:3
XMLHttpRequest.send (async)
send @ v2.js?1519751058:3
ajax @ v2.js?1519751058:3
Z.(anonymous function) @ v2.js?1519751058:3
o @ v2.js?1519751058:15
(anonymous) @ v2.js?1519751058:15
each @ v2.js?1519751058:1
each @ v2.js?1519751058:1
t.fn.infinitescroll @ v2.js?1519751058:15
(anonymous) @ yourlibrary.js?v=31:38
u @ v2.js?1519751058:2
fireWith @ v2.js?1519751058:2
ready @ v2.js?1519751058:2
o @ v2.js?1519751058:1
thumb.webp:1 GET https://s3.amazonaws.com/files.d20.io/images/1457... 403 (Forbidden)
Image (async)
(anonymous) @ v2.js?1519751058:2
domManip @ v2.js?1519751058:2
append @ v2.js?1519751058:2
(anonymous) @ yourlibrary.js?v=31:55
b.each.b.forEach @ v2.js?1519751058:5
callback @ yourlibrary.js?v=31:51
a @ v2.js?1519751058:15
u @ v2.js?1519751058:2
fireWith @ v2.js?1519751058:2
i @ v2.js?1519751058:3
(anonymous) @ v2.js?1519751058:3
XMLHttpRequest.send (async)
send @ v2.js?1519751058:3
ajax @ v2.js?1519751058:3
Z.(anonymous function) @ v2.js?1519751058:3
o @ v2.js?1519751058:15
(anonymous) @ v2.js?1519751058:15
dispatch @ v2.js?1519751058:2
g.handle @ v2.js?1519751058:2
trigger @ v2.js?1519751058:2
(anonymous) @ v2.js?1519751058:2
each @ v2.js?1519751058:1
each @ v2.js?1519751058:1
trigger @ v2.js?1519751058:2
(anonymous) @ yourlibrary.js?v=31:88
dispatch @ v2.js?1519751058:2
g.handle @ v2.js?1519751058:2
thumb.webp:1 GET https://s3.amazonaws.com/files.d20.io/images/1457... 403 (Forbidden)
Image (async)
(anonymous) @ v2.js?1519751058:2
domManip @ v2.js?1519751058:2
append @ v2.js?1519751058:2
(anonymous) @ yourlibrary.js?v=31:55
b.each.b.forEach @ v2.js?1519751058:5
callback @ yourlibrary.js?v=31:51
a @ v2.js?1519751058:15
u @ v2.js?1519751058:2
fireWith @ v2.js?1519751058:2
i @ v2.js?1519751058:3
(anonymous) @ v2.js?1519751058:3
XMLHttpRequest.send (async)
send @ v2.js?1519751058:3
ajax @ v2.js?1519751058:3
Z.(anonymous function) @ v2.js?1519751058:3
o @ v2.js?1519751058:15
(anonymous) @ v2.js?1519751058:15
dispatch @ v2.js?1519751058:2
g.handle @ v2.js?1519751058:2
trigger @ v2.js?1519751058:2
(anonymous) @ v2.js?1519751058:2
each @ v2.js?1519751058:1
each @ v2.js?1519751058:1
trigger @ v2.js?1519751058:2
(anonymous) @ yourlibrary.js?v=31:88
dispatch @ v2.js?1519751058:2
g.handle @ v2.js?1519751058:2

Is there any solution or workaround available to this problem, or am I doomed to sit and click 30 items at a time until the heat death of the universe? 

Thanks