The team might already be working on it but I was recommended to report this bug by someone on a forum thread of me asking about it. The forum thread can be found here. EDIT: Added my phone to operating system as well since it happens to me on mobile too.

• Operating system and browser: Windows 10 and Moto G Power(android), Opera GX (Note: I also tried google chrome and got the same error)
• Description of the bug: Whenever I try to submit an image for a character it tells me that the site can't be reached. I can upload blank characters with no images just fine. I've only managed to brute force it to post an image/character twice. This also only started happening to me last night. 
• Link to code that made the bug appear (if available): N/A
• Screen captures (if available):