Yeah, the dimensions and file size there sound fine. Maybe upload it to an image hosting site like imgur and try uploading it using the link via mobile?
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Tried this, still seems to just infinitely load. Not sure what the deal is.
The same file/link works fine if it's done on another guild, and we've tried transferring leadership and having other people do it with this guild, it just seems that this guild in particular can't get anything uploaded