Adding media to profile

[seafol]

Hi all. I'm trying to add media to my profile, and found a previous post about it. However, when I copy and pasted the code in, I get "Adobe flash player is no longer supported". I'm using Chrome, and don't really want to switch browsers just to view FCF.
The code I copied is: <object type="application/x-shockwave-flash" style="width:450px; height:366px;" data="https://www.youtube.com/watch?v=5h4hGtjes_8?autoplay=1?color2=FBE9EC&amp;rel=0&amp;version=3"></object>. What I need to replace is the "application/x-shockwave-flash". I Googled, and got this: <iframe width="560" height="315" src="https://youtube.com" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>. However, when I save the changes and look at my profile, in the Media section it ignores the coding altogether. Same goes when I use the embedded coding directly from YouTube. (<iframe width="560" height="315" src="https://www.youtube.com/embed/4b74gYPLdc0?si=3UaVrFhHceJd0f2C&amp;controls=0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>)
It just ignores it.
Any suggestions for what to use in order to get a YT vid to embed will be greatly appreciated. TIA!

[seafol]