Sorry to hear it's being stubborn for you!
There's an Indigo bug relevant to this situation, which is that the System Stack is not rebuilding itself to include the newest nginx config. This was updated recently to include the line
client_max_body_size 0; (0 meaning unlimited).
To get that config active, you should:
- quit Indigo
- and then restart Indigo. The nginx_reverse_proxy will be detected as missing, and rebuilt.
This will ensure you have the latest system nginx config. Sorry about this bug, it's on my list.
Let me know if that fixes the problem for you!