Hi Aaron,
Unfortunately, GemBox.Document uses WPF for reading PDF files.
So, even though you can write PDF files on Azure Functions, I’m afraid you cannot read them.
But also, I should point out that PDF reader in GemBox.Document never left the BETA stage, it has limited usage. For more information, please check the Support level for reading PDF format (beta) section.
Instead, I would suggest you try out GemBox.Pdf, see its Reading example.
With GemBox.Pdf you can read and write PDF files on Azure Functions.
Last, in the long term, we plan to replace the current (internal) implementations of both PDF reader (BETA) and PDF writer in GemBox.Document with a newer implementation that’s contained in GemBox.Pdf without changing the public API of GemBox.Document.
But that will not be done in the current year and for later I cannot say at this moment.
Regards,
Mario