I too found the perfect bag just today after 40+ years of photography and possibly 20+ bags.
Tenba Axis 16L. I can hold my 3Legged Thing tripod on the back on molle in the center or inside and still have room for an X-T5 and 3 lenses. Narrow, swings around like a Lowepro Flipside so not putting it on the ground to swap lenses (I'm a Prime shooter and that's crucial) Looks cool too (multi-cam black) Happy as a clam.
I removed the lens and the sound is heard from the body.
PreAF is disabled. Stabilization is turned off. Only electronic shutter is ON. The sound can still be heard.
It is quiet, I have to put my ear to the body to hear it.
It is somewhat similar to the sound of a freely rotating bicycle wheel. Like a noise from its bearings.
Is the sound coming from the camera or the lens? Does the lens have OIS?
The most likely thing is that you have pre AF turned on and its trying to focus all the time.
You can tell by turning off both IS (in the shooting menu or switch on lens) and Pre AF (in the AF menu) and see if the noise goes away.
Then turn back on IS and Pre AF one at a time and see when the noise starts.
If the card has been formatted in a FujiFilm camera then the format should be fine for the iPad.
Did you use the same card reader with both laptop and iPad?
Is the laptop a Mac and how did you read the files on the laptop.
How do you know the iPad doesn't recognize the SD card?