Hi @Tangeek,
I’m not sure what your specific issue would be here, but we definitely don’t handle large files well so that would likely be it. If I remember correctly, we load it into memory and then if it’s an image, we make a couple copies (also in memory) to generate a thumbnail and such. That’s part of the reason that we use a default file size limit of 50 MBs.
I can check to see if we have a ticket to improve that, but in the mean time, I’d recommend using something like Google Drive or Dropbox and sending a link back and forth.