Uploading Large File in Blocks

" Uploading Large File in Blocks" doesn’t work with unencrypted files. when I try to upload normal file block it always shows “500 Internal server error”. But seafile documentation didn’t mention block file upload only working in an encrypted file (Seafile Server ). There is any way to upload unencrypted files by “block”?

Please elaborate on your problem. Explain what you try to do, how you do it and tell us the outcome. Screenshots are always helpful.