TWRP not recognizing SD card.

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Hello, my phone is running Invicta and I'm trying to flash Lineage through TWRP, but the issue is that I just got a micro sd card as I had stored all my data on my system memory. My phone prompted me to transfer my data to it, so I did. When I tried to get into TWRP, it popped up with a message about the ROM. I ignored it and swiped, and it took me into TWRP. I went to the install area and I found that it was still on my internal storage, so I tried to switch it over to the microsd and when I selected it nothing happened. Are there any ways to fix this?