Hello, did you already try the esp32-cam-mb module? It’s a module witch gives the possibility to program esp32-cam with usb via a ch840g chip.
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Thanks in advance for your help.
 
Bernard

Link for info 
https://fr.aliexpress.com/i/1005001727298286.html

Hi.
Yes. We’ve ordered one a few weeks ago. Thanks for sharing.
That’s definitely something that we want to try. It would make the uploading process much easier.
Thanks for sharing.
We’ll write an article about that as soon as ours arrive.
Regards,
Sara