In my situation, I had to include some documentation to my state return. I had to upload the documentation within the TT My wife scanned the documents but she scanned them as jpg files instead of pdf. The jpg files are "pictures" which makes the files very big. The jpg files were like 25 million bytes; the same documents in pdf were 25 thousand which is easy to transmitte via email
If you have a windows computer, look in you list of files, find your file(s) you want to upload and confirm your files are pdf, then next to this it will show you the size of the file. If you scanned them with your phone, they are probably jpg (picture files)
