How to use value? of input type= "file"

<input type="file" />

I give users several ways to upload messages like
one is to press the input option
, the second is that I have caught the image address of the facebook, and I"m going to put this on the file.
when the user presses submit, it will be uploaded to my server, and do other image processing
, so this action is necessary. Otherwise, I can only deal with the image
, but I find that if I add value, he still doesn"t have an image selected
, so when I press submit, there is no image that can be uploaded

$_FILES["myFile_cover"]["name"]

can"t get a name
how do you realize that even if you only have a web address, you can still choose the effect of local press upload?

Html5 php7 php

Mar.17,2021

Why don't you put the captured avatar in a hidden domain and put the file in file?

refer to frontend picture direct transmission OSS experiment the first three part, do not have a name because when you build a FormData instance, you call the append method without the third parameter (file name). Or when writing PHP, if there is no file name, then temporarily generate one (for example, you can use time + N-bit random number), this method is also more common.

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