FOR YOUR VOID-FILE-UPLOAD-COMPLETION IS WITH THE POSSIBLE-TOO-LARGE-FILE-SIZE &/OR: SLOW-[IN]TERNET-CONNECTION. FOR THE FILE-SIZE-MODIFY &/OR: BETTER-WIFI-CONNECTION IS WITH YOUR POSSIBLE-POSITIVE-FILE-[UP]LOAD.
For a difficulty-uploading-files, the file-size could be too large or your internet connection is slow. Resize and try again or try a better wifi connection. You may need to email/contact admin.