we have a journal, where articles are written in LaTeX. We ask at submission and review stages the author to upload the article in pdf format, and when an article is accepted, upload the source files in a zip. Unfortunately, there is no place where the author can upload the sources such that the files can easily moved to the copyediting phase. Actually, when we accept an article, the sources are still not present, and later if the author upload it as a revision, it cannot be transferred to the copyediting phase, nor directly uploaded there by the author.
Is there any way to overcome this leak?
Thanks in advance,