Synonym for "media item"

Solution 1:

I refer to these in my professional life as "assets".

Solution 2:

In my projects I usually go with resources.

Solution 3:

If it had to be one word, I might describe it as a "work." A one word description of all things published is not something easy to say without really broad, possibly oversimplified terms.

Solution 4:

If you are discussing these 'media items' in terms of things you want to include in a page, or something similar, then possibly "insert".

If they are things that you or a client of yours has created, I'm thinking, 'opus'.

Solution 5:

Since media is plural, could you just use medium? Per Wiktionary:

A format for communicating or presenting information.