Best Practice Help on adding a collection of training videos into application

If you have the videos uploaded to YouTube or something similar, iframes would be the way to go. YouTube will create iframes automatically when you click Share > Embed, and you can directly paste the information into a rich text field. Otherwise I'd have to ask for more information on what you're planning with this app.

Take a look at this and see if it does what you need:

https://community.quickbase.com/quickbase/topics/stream-quickbase-video-file-attachment