Im trying to upload my files to Google Drive via REST API (resumable upload).
Everything looks good (XMLHttpRequest triggers onprogress and o
I think this would be related to raw photo files, because DRIVE tries to convert them to JPG as is done in Google+, unless you specify convert=false. You should specify in your upload API to not convert that files.
This second post says that it will allow you to preview the file up to 25MB, this size limitation could be related with your troubles. Maybe you could try to upload another photo with less than that size to ensure it's not this the limitation.