Hello
In Azure there are "two types" of permission, the control plane (outside of your resources) and data plane (inside your resource), (simplified explanation). You are trying to access the data plane of the file share so you need to add specific permissions on the IAM blade as shown below :) Owner gives you all the rights on the control plane, but does not automatically grant you any permission on the date inside the file share (owner can always assign these to itself tough).
Here you can read some more on the permission on Azure file shares.
Hope this is helpful and remember shared knowledge is the best knowledge š Best Regards, Timmy Malmgren
---If the Answer is helpful, please click "Accept Answer" and upvote it as it helps others to find what they are looking for faster! Ā