How to add an IMAGE to Apple Wallet on iPhone

You may, of course, add images to your Photos and house them there.

fotodocent wrote: "...Did want to have these data handy in more than one place on the phone."

Custom shortcuts can offer several ways to display your data. The example below is a simple shortcut that presents a pre-configured menu of photos to choose from:

Notes:

• The photos are assumed to be already in the Photos app.
• To set up the file name of a photo in Shortcuts, reveal its name by swiping down on the photo in the Photos app.
• The photos could alternatively be stored in iCloud Drive and the shortcut modified to obtain them from there.
• An icon to run the shortcut can be placed on the Home screen.
• Or a shortcut(s) can be placed in a widget – which can be vertically scrolled.

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Not all objects can be added to Wallet. “A JPG or PNG of my heart stent info Card” cannot possibly be added unless the provider worked with Apple to arrange a way to do that.

Add, use, and share boarding passes, tickets, and other passes in Apple Wallet - Apple Support

Similarly, some but not all COVID vaccine documentation may be added to Wallet.

Add verifiable COVID-19 vaccination information to Apple Wallet and Health - Apple Support

There may be a way to add something like that in the health app.