I have some information that I show in my upload form: - The limit of file size - Available file formats to upload
Should I hide this information after user have uploaded 1 or more files? Images attached
I would advice against removing critical information from the screen.
From the screenshots you've provided, I don't see any way of bringing back the information about the file size. Just because the user already performed a valid action, doesn't mean there isn't a chance of them forgetting the instructions or making a mistake.
The problem will become more pronounced if the user tries to upload in bulk. Just imagine having to show 20 errors for wrong file size and the effort the user would have go through to correct the mistake.
Just like you don't remove the, "Drag here or browse to upload files" instruction, keep the instruction about the file sizes, format, etc. also available on the screen. You can, however, choose to minimize it even though it isn't the best practice.