I can't upload (some) pics from my phone with the app
It says "value <html> of java.lang.String cannot be convert..." and then it cuts off.
It mainly happens with pictures I took with my camera, or I already had on my phone. Case in point, I can upload the frog but not my cats.
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It's likely your instance getting overwhelmed. Happened to me yesterday. Worked on my alt account on a separate instance. Just had to wait a bit and the issue resolved itself.