Uploaded file showed up with 0kb size.

[Amruta Jagatap]

I have a code to upload files to a page through the processwire API. It works fine usually. But I faced a single issue where the uploaded file showed 0kb size.
Where could the upload have gone wrong?

[BillH]

You may find an answer in this discussion, which has a number of suggestions and links:

It might also be worth checking that you haven't run out server space.