Is it possible to put a copy of my COVID19 vaccination card in my Apple Wallet?

See the instructions in Add verifiable COVID-19 vaccination information to Apple Wallet and Health - Apple Support

My card isn't supported so I just stored a photo of it with my photos -- I have other cards there that aren't supported and keep them all in an album so they are easy to locate.

Yes, if it is a verifiable card, not all of them are. Did you follow all the instructions in the article that you came here from?

Yep. And several others.

Mr. Fifth, not sure if you are aware but the OP actually came here from the link that you posted, the one listed under Related Articles. While some thought it was put there by the system the moderators have confirmed it just showed the found that link and then click on the link in the article to come here.

No I was aware. That is how the forum worked a number of years ago, then it disappeared for a few years before that functionality returned.

I still reference the article in my response if it was an article that was relevant.

Wasn't sure and yep, I remember that. I just take the shortcut version to refer them back to the relevant version. On a number of those I wish they would switch the order of go to ASC and contact Apple Support.

Agree -- or eliminate the ASC reference entirely in some cases such as the disabled in iTunes and App Store article where the only solution is to contact Apple Support.