[mothered]

but I have a question regarding that.
They are going to tell me to send it again because it cannot be opened, do I keep sending the same damaged file every time they ask?

Correct, they will repeatedly request to send It and you do exactly that, but In different file formats and assure them that It's working perfectly fine on your end with each change of format.

This gives the Impression that you're doing your utmost best to resolve the matter.