We have a document library that needs to be read/write, but want to make the app part that appears on the subsite home page to be read only.
This is because we've created a 'Recently modified' view that we use on the app part, which shows the results in a flat structure (i.e. without the document library folder hierarchy), and don't want users dragging new documents into a flat view of the document library, as that just drops files into the root of the document library, which we want to avoid.
When users enter the document library proper, they see the 'default' view, which includes the hierarchy and we obviously want them to be able to add documents in this manner, it's only the app part view on the subsite page that we want to prevent users adding new documents to.
I've looked at the web part properties and can't see anything that will achieve this.
We're using Sharepoint Foundation 2013