I can write to it over smb share except for whatever reason there's one folder left over "Lost & found" My mac displays it with a red dot and I don't have permissions to access it--can't even delete. Normally I'd move on but it's taking up about 10% of my drive.
Each ext4 partition has a lost+found folder. It was created together with the partition. Any recovered file during filesystem check will be moved here. I never deleted it, but i guess it's possible and won't make any problem. To do that you must ssh to the router with root. Dot in the beginning of the file or folder means its hidden.
I can see sda1 and sdb1 but neither of those are my drive. I need to find mnt/sda2. It was there last night but since rebooting I just cant find in under smb. Like I said it shows up in Luci, and I checked enable mount, saved changes, rebooted and tried various cobos of that.
Have you connected two drives to both usb ports? sda1 is the first partition on the first drive, sdb1 is the first partition on the second drive, etc.. It seems you plugged in some other drive as well in the meantime, so your sda2 changed to sdb2. Normally it should be mounted automatically on boot.
I don't see a ton of options under mount in the ui.
Have you installed samba package for luci? (luci-app-samba) If you did, you have a "Network Shares" tab under "Services" with more options. Like here.
Most of these are not openwrt related but generic linux questions, so if you check some generic linux howtos (mounting, filesystems, basic shell commands, etc) you will have better understanding whats going on, and that will boost your problem solving skills.