Hah… FYI, I just got OTA working on the ESP32CAM 
… read here for more info if you want.
Great, )))) 
Are you certain that there’s nothing using 145? (Set up a dynamic IP, see what’s assigned to the device, shut it off, change it to a static IP at THAT address, and it should work,)
I like using this program to track what device uses what IP across my whole network. Simple and “just works”