How to mount in TWRP? I've never mounted in TWRP, a script advices doing so. Can I mount directly from TWRP's mount screen? I can select the partitions to mount, but see no option execute.
Does rebooting/booting to the system the device mount the selected storage partitions?
Can I mount directly from TWRP's mount screen?


Yes. Under the category Mount you would see a range of partitions available to be mounted. Selecting an entry (check-mark) would automatically mount the corresponding partition and deselecting the entry would unmount that partition. You can mount/unmount multiple partitions.

You can verify the said method by executing the command mount when selecting/deselecting the partition(s), via adb or through Advanced tab &rarr; Terminal Command.