this solution work with me
https://www.digitalocean.com/community/questions/permission-denied-whenever-uploading-files

A simply search on an engine would’ve found you multiple soultions.
Source 1: https://stackoverflow.com/questions/8103860/move-uploaded-file-gives-failed-to-open-stream-permission-denied-error-after
Lesson 1: Search the end of the error if you don’t understand what to do in the event of an error. (99% of the time someone else has had the same issue before)