When I try to upload a build/zephyr/dfu_application.zip from a Google drive with nRF Connect 2.7.2 on iOS, it shows this error, when I click "start":
On Android with nRF Connect 4.26.1 (note, the version numbers are not in sync, it is both the latest App Store/Play Store version) it is no problem. I can also use DropBox on iOS without problems, so looks like it is some problem of the Google Drive integration.
Here is the zip file with which I tested it: https://www.dropbox.com/scl/fi/8esgjtyfscjb6lpc2zmif/dfu_application.zip?rlkey=dl60d1shhdftj41vs6sxw6oik&dl=0
Built from the "zephyr/samples/subsys/mgmt/mcumgr/smp_svr" project with "west build -p --board nrf5340dk_nrf5340_cpuapp". Since the download doesn't start, you can test it with any device which supports DFU, just connect to it and try to upload with the DFU tab.