BC SharePoint External File Storage view threshold exceeded

I recently set up External File Storage in Business Central. The view and folder structure were automatic, and the file links and communication between the two applications seems tenuous. Very quickly I ended up with a view threshold exceeded error in the SharePoint library. I was told that this is a known issue and Microsoft suggested the below mitigations. I plan to do the indexing when I don't have users logged in. I simplified the default view. I can't apply a retention policy in BC because the associated table is not included in the allowed tables. I'll give some thought to the Azure Blob storage option. My question, however, is what do they mean by "Partition attachments across multiple libraries"? This option intrigues me but how do I do that without breaking the file link between BC and SP? TIA.

Recommended Mitigations