Normally, this should not reboot. Can you give a bit more context: the SDK you use, the actual code that reboots?

Note that this is a forum for the ESP32, not the ESP8266. You may have better results asking somewhere else instead.

As far as I'm aware, the webserver is filesystem- and device-agnostic, so you can have it serve anything that appears in the esp-idf vfs tree, including SD-cards.

Erm...
That would make both variables refer to the exact same channel.

You should be able to override that by using a jumper wire to connect GPIO0 to ground, holding the reset button, and then plugging the module in. Wait a second, release the reset button and you should be able to reflash the board. I'm curious to what the sketch does; apart from e.g. using an I/O as ...

As far as I can see, the ESP Cam board just has a standard ESP32-Wrover/Wroom module on it; you should be run anything on there that runs on a non-Cam board as well.

The process of getting a custom PCB printed is relatively expensive... Errm... no? Ordering custom PCBs has never been cheaper; you can get 5 medium-quality double-sided PCBs for a tenner or so, depending on size. I'd advice you to pick a PCB program (I'm partial to Kicad, but there are lots of oth...

Yes. The branch you are on will take you from beta to rc to final; it will also give you minor updates (v3.3.1, v3.3.2 etc) after release.

What's your code? The issue you may be running into is that all LED channels share two timer, so you can generate at max two frequencies, and you need to explicitly set up these two timers for this.

It depends, what's your use case? How's the setup going to be used in practice, what is it for?