Greybeard

Press the button on the rear top left of camera https://fujifilm-dsc.com/en/manual/x-s10/taking_photo/continuous/

Turn off Flickerless SS Setting https://fujifilm-dsc.com/en/manual/x-t5/menu_shooting/shooting_setting/#flickerless_s-s_setting

There is a 4GB limit when a Mac computer is attached to a FujiFilm camera by cable - not sure if its an Apple problem or a FujiFilm problem - same doesn't apply when files are transferred by card reader.

I’ve never seen anything like this in the FujiFilm app - where did it come from?

No - JPG should be fine

I'd recommend a card reader

The only thing I can see that you haven't specifically mentioned is to turn geotagging on: https://fujifilm-dsc.com/en/manual/x-t5/menu_setup/save_data_set-up/#geotagging

The X100V has a leaf shutter built into the lens which operates differently to the focal plane shutter that other FujiFilm cameras use - it operates differently and looks different.

The most effective way I have found is using Capture One Pro - when connected by cable this makes it very fast (the software is subscription but not horribly expensive if you frequently need to tether)

The reason you don't get the delay with CL or CH modes is that Clarity only works for single shot.

https://fujifilm-dsc.com/en/manual/x-t5/menu_setup/button-dial_setting/#ae-af-lock_mode

How are you looking at the file/video? Are you using a card reader?

This seems to be normal - I believe its because of the linear motor - try putting the lens on the camera and turning the camera on so that the motor is activated - the sound should go away.

No - there is no switch - firmware update won't be possible - there has been a suggestion that the lack of switch improves weather sealing but I don't know if that is true.

Interesting - thanks for posting this

Keep scrolling down - connection settings are in the sub-menu accessed using the symbol with the double arrows underneath the spanner.

If you long press the disp/back button you should see which function is associated with each of the buttons - scroll down and see if Q is associated with Q

Which lens? There has been comment that its not supported by XC lenses - but I don't have one so can't confirm

The X100 series don't support tethering

I don't have the Atomos Ninja V - but does it record in F-LOG? This would override any film simulation.

This is about a limit of 4GB (binary GB) in transferring using the cable - as you have noted the workaround is to use a card reader. Its not clear if this is a FujiFilm issue or an Apple issue - or both. FujiFilm could do a better job of making this well known as it just happens without any error message and it isn't obvious it has happened until you try and run the chopped file (or look at the size).

Hmm - I used to have the original X-T30 and X-T3 - and as you say you get extra features with the X-T3 versus portability. If things like weather sealing, two card slots, better viewfinder and tilting screen are priorities go with the X-T3 - but if you want something that is almost pocketable (at least with lenses like the 27mm) go with the X-T30 II - they are both good cameras. The X-T30 II also has the complete auto function that is handy if you are lending the camera to someone else who hasn't had time to learn the controls.

Do I have a defective firmware ? No - you just have an old camera - Color Chrome Effect wasn't introduced until the X-T3

I don't believe it can be done - it doesn't have the counter in the EXIF that other X series cameras have

No - You are going to have to do it manually.