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You could try updating to LR 7.3.1 from the apps tab in Creative Cloud.
I have the same issue in LR 7.3 and 7.3.1 with .SRW files from my Samsung NX1 and other Samsung NX cameras. It works fine in LR 7.2 or older.
I have found a couple of workarounds. You can insert the SD card to the PC after you've opened LR and then the .SRW files show up. The other workaround is to select the SD card as a source in the import screen under the "Files" category, where all your other disks are too and the SRW files will show up. If you select the SD under the "Devices" section, it omits them, unless you do my first workaround.
You could even rename them to .ARW or something and then they show up always everywhere, but that takes more time.