Need advice on document annotation tools

Hey everyone,
I’m a developer working on a project that requires robust document annotation capabilities. I’ve been tasked with integrating a tool that supports things like freehand drawings, comments, and file attachments. I’ve tried a couple of open-source options, but the customization has been a nightmare and hasn’t fully met our needs.
That’s when I stumbled upon Apryse SDK. From what I’ve seen, it offers over 35 powerful annotation tools, including options for adding text, highlights, stamps, shapes, and even signatures. It also allows for real-time collaboration, where multiple users can annotate the same document and see updates instantly. The SDK seems reliable, flexible, and packed with features, but the only catch is that it’s not free. I’m hesitant to commit without hearing from others who’ve used it. Has anyone here worked with Apryse? Is it worth the investment, or should I keep looking for a better solution? Any advice or experiences would be super helpful!