For Unraid version 6.12.3 use the built-in tool. Tools > New permissions (the icon looks like a folder with a checkmark in it)

Select the shares folders that you want corrected and click start. This solved it for me and no need to install additional apps.

Dropping this in here to help others.

Thank you! This fixed my stupid issue that I have been dealing with since upgrading my computer!

This worked for me too, thanks!

the man, the myth, the legend!

Go to Tools > Docker Safe New Perms and run it. Se if that helps.

Sometimes certain dockers might mess up the file system rights.

Unfortunately that did not work

I suggest you look for "Dynamix File Manager" and install it from the Apps tab. You can then review and set permissions for folders from the unRAID GUI.

How do I access that? I downloaded it, but don't see it anywhere in tools. I see a file manager tab was added in the top right corner of the dashboard, I clicked on that and am taken to a different tab which shows the disk numbers and user numbers. When I select the disk and click on the permission icon it takes me to a different window where I can select folder permissions for owner/group/other. When I apply the read/write permissions it doesn't seem like it does anything and still doesn't solve the issue. Am I missing something?

Another thing, if I change the folder to public instead of secure I can edit it. Its only when its set to secure is when I get the permission error

Map the share in windows using the unraid user credentials