Are there file manager that can access two (or more) USB devices?

I have a USB hub with a built-in SSD and a SD card reader. If I connect it to my PC, I can access both the SSD and the SD card and copy files from the SD card to the SSD. If I connect it to my phone (Pixel7), in the Files app I can only see the SSD (and no, it's not the SD card that is improperly seated). Is this an Android restriction or a file manager restriction, and if the latter, are there file managers that will access both devices? I have seen [this question](https://android.stackexchange.com/questions/90295/otg-is-it-possible-to-connect-two-devices) but that was 10 years ago....