Edit Container Fields Requires Full Privilege

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I recently converted a cashbook app from 11 to 12  - it has a simple global container (not saved remote) that is for the user to import their logo - jpg etc .   Same application works fine in 11 with simple data_entry level access but in FMP12 it requires full access. Any other level and the field becomes inaccessible.   

 

I have created new global containers and they behave the same way.  It is something to do with privilege settings but I can't find anything wrong and I can't find any reference to this anywhere on the web.

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It was the user level set at Admin - change to data_entry and it works