(Adj) Word for "Related to the content" of media, rather than related to the medium

I’m talking about the different problems related to the experience of watching lecture videos.

• Certain problems such as video resolution or audio quality are technological.

• Other problems are related to the content of the videos, such as incorrect information being taught, or long periods of action without speaking (ie writing on the board).

How can I describe the latter problem? I’m leaning towards contentual, from this question with the following definition:

contentual

adjective

Relating to content (as apposed to context)

The answer to that question says ‘contentual’ is in the OED, but I haven’t been able to find it.

Can I use ‘contentual’? If not, what adjective should I use?