Thanks I will look into TWRP, and try access the storage.
Thinking about things, a couple of weeks ago I upgraded the S7 to the latest e/OS v2.7, it had stopped updating about 12 months earlier, so the update jumped a few versions, and since going to v2.7 have had this problem with storage.
I followed your previous help with my S9 to force the upgrade on the S7: