Thank you all. The main issue is that most cameras won’t act in file transfer mode as well as camera mode at the same time. Those that can are ‘tethered’ and these are high end cameras. Anything like a web cam has very low resolution.
The best options are likely to be an overhead scanner or as
@ColinJ suggested, a
phone that synchs to the cloud.
I don't have any photographic skills other than point and click. I was going to make exactly the same suggestion as
@ColinJ
One further comment. I don't think you need a "phone that syncs to the cloud." It is the Google account that syncs to the Google drive, the personal cloud storage, which comes with a Google account. The standard Google account includes 15GB of storage, you have to buy additional storage if you need it.
If you go down this route just about any Android phone will run Google and be very quick and easy to set up. It will be possible on an iPhone but Apple will probably add some additional hurdles.
Another possibility is Microsoft. I subscribe to the MS Office suite. This is +/-£95 pa. It has a number of additional benefits, one of which is 1TB of storage in One Drive. I believe Google charges +/-£8/month (£96pa) for 2TB. You'd need to check this.