@Richard Scannell Thank you for reaching out to Microsoft Q&A. I understand that you want to know the best way to store a large number of files in Azure with query able custom metadata.
You can use Azure Blob storage for storing large amounts of data. Since you mentioned docs/pdfs/mp4s specifically, you can go with Block Blobs. Here is the different type of storage options available- https://learn.microsoft.com/en-us/azure/storage/common/storage-account-overview?toc=%2Fazure%2Fstorage%2Fblobs%2Ftoc.json#types-of-storage-accounts.
You can check this thread for different storage options and their specific use cases- https://stackoverflow.com/questions/29079268/differences-between-azure-block-blob-and-page-blob
In regard to the metadata, please check out how to setup and query the Blob metadata using REST API- https://learn.microsoft.com/en-us/rest/api/storageservices/setting-and-retrieving-properties-and-metadata-for-blob-resources
Hope this helps. If you still need any further assistance, please let me know and I will assist further. Thank you!
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