Some GIFs can cause errors when uploading to Confluence

Steps to reproduce:

1. Download the two GIFs on this ticket.
2. Create a new page in Confluence.
3. Upload the gifs to the page and insert.
4. Save the page.

What happened

There are errors in the console when uploading and inserting the GIFs. They appear to display in edit mode, but upon saving the page, they do not render.

What should have happened

They should upload and display normally as other GIFs.

Possible cause

Too many frames in the GIF

Workaround

Reduce the number of frames by splitting the GIF.