I'm surprised Tools > Find Files isn't working. Can you show a screenshot of have you have the Find panel set up?
More generally, I usually recommend using FTP over Wifi to access phones rather than USB (MTP and transferring files with Android and iOS phones, Cameras), at least if your Wifi speeds are good. It's a lot more reliable, since the USB method uses MTP which is very poorly designed and implemented by most phones and OS (e.g. can't access two files in parallel).