Iphone Flashing in Macbook Finder
I have solved this issue. Plug your iPhone into the Macbook with an Apple brand cable. Pull up activity monitor on Macbook. Search "usbd" in the activity monitor. Click "usbd" and select force quit. If you do this a couple of times it will stop flashing and a solid connection should happen. This worked for me and many others.
MacBook Pro 15″, macOS 12.3