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Docotic.Pdf
Docotic.Pdf library can create, edit, draw and print PDF files in .NET Core, ASP.NET, Windows Forms, WPF, Xamarin, Blazor, Unity, and HoloLense applications. The library is a 100% managed assembly without unsafe blocks. The assembly has no external dependencies.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
you can either write a web app to expose this functionality via an HTTP API and host it somewhere (e.g. by writing a ruby on rails app that does something like https://askubuntu.com/questions/50170/how-to-convert-pdf-to-image), or use the poppler C++ library directly from your Unity app - see https://docs.unity3d.com/Manual/NativePlugins.html.
If you decide your time is worth more than a grand, then https://bitmiracle.com/pdf-library/ might be a good solution.