HFS+ drive mounted as read-only

Trying to add new files to an external SSD that is formatted as HFS+. I added “hfs+” and “hfsplus” (not sure which is correct) to boot.supportedFilesystems and rebuilt. Device is still being mounted as read-only.

I’m asking about HFS+ in this case, but what should I do, generally speaking, when I run into this issue for other file systems as well? (like UDF or something)

Thank you

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