Do we retain copyright and so can use our photos and videos on YouTube?

Thank you for your prompt response Nancy.

I have read the main agreement several times, and did not find it specific enough to my questions, hence asking the community.  Thank you or the other links, one of which I believe applies most:

An owner of a copyrighted work has the exclusive rights to distribute, reproduce, publicly perform, and modify that work. The owner can also grant some or all these rights to customers.

By submitting content to Adobe Stock, you are promising us that you own or have a license to the copyright in the content itself. You license your content to Adobe based on an upload agreement or a content license agreement, such as the Adobe Stock Contributor Agreement. We then license the content to clients via our Terms of Use or specific download/enterprise license agreements. For more information, see Use of your content. 

My main platform is YouTube, and hence wish to ensure no copyright strikes.  I only found out about stock photography as a contributor today.  As I own the copyright, I have the original file which is digitally dated so I could challenge any strikes.