So that the 'modified' time for attachments such as photographs is the time that they were actually modified (mtime) rather than just copied from one place to another (atime). This should help with speeding up synchronization with applications such as GoodSync that can access QField's storage in the protected and preserve the mtime of the files it copies.

I've so far had decent results with a little python script that ChatGPT wrote for me that reads the mtimes from the files in the DCIM folders of the folders that GoodSync copies to, and copies them into the files in the QGIS project (run after synchronize), and

likewise after the project is packaged, copies them from the project DCIM to the DCIM of the export folder, for GoodSync to shift them back onto the phone.

Eg no useless and timeconsuming copies of photos that rarely if ever change. If a photo is changed in QField, by for example drawing a line on it, it gets copied by GoodSync. Which is unfortunately not free, but when I started trying to deal with this maybe a year ago, was the only sync program I could find that was able to get copy stuff to and from protected storage with reasonable behavior.