I would like to to add media content as videos and audios to my website. We are using TYPO3 7.6 and tt_news 7.6.1. I tried to use rgmediaimages extension but this does not work in our version of TYPO3. Someone know how to put media content in a tt_news record in another way?
This depend on your knowledge of extension development, but you can easily extend tt_news with new fields and functionally. There are some hooks you can use: documentation.
And better option is, as said in previous comments to switch to news extension. For that you can create local backup of website, do the migration and upload changes.