This thread seems to be a duplicate of the following threads from that all contain mostly the same problem:
- Issue with Arc on Ubuntu
- Plug.upload doesn't seem to pick up uploaded file from app but works from web interface
- Questions about ARC in phoenix/elixir api
- How to send a picture in json as from web to elixir
Please check if any of them contain an answer for you. Really not sure why there are so many threads about this, with the same filenames even. (In fact this is a verbatim copy of the last thread in that list.)
