If you start editing bitstreams for an Item where not all bundles are present (as in example there is no THUMBNAILS bundle), user must manually create a THUMBNAIL bundle if he wants to add thumbnail.
That seems normal for a well educated editor/admin, but its not very clear for a new starter, also there is a chance of mistakes in this process.


To avoid confusions the 3 standard Bundle names could always be present in the Bundle selector, even if these bundles are not available in the particular Item.
If you start editing bitstreams for an Item where not all bundles are present (as in example there is no THUMBNAILS bundle), user must manually create a THUMBNAIL bundle if he wants to add thumbnail.
That seems normal for a well educated editor/admin, but its not very clear for a new starter, also there is a chance of mistakes in this process.
To avoid confusions the 3 standard Bundle names could always be present in the Bundle selector, even if these bundles are not available in the particular Item.