When I try to upload a file from the FTP file manager online and from FileZilla it happens that the file manages to upload but it is instantly deleted
I used translate
I speak spanish
I have a file in the directory “public_html” called “Do not upload files here”
You should upload files to htdocs folder
Did you check this article already? https://infinityfree.net/support/why-are-my-files-deleted-after-uploading/