Hang on, not so fast, this is in fact doable. Here’s a quick tutorial.
Assumptions: you have a Airtable table with an field of type Attachment, named “Image”, with one image in it, and you have a field of type Single Line Text, named “Alt Text”, containing the alt text for that image.
First, add a Formula field named “Img Tag”, with the following formula:
"<img src='" & MID({Image}, 1+FIND("(", {Image}),LEN({Image})- (1+FIND("(", {Image})))&"' alt='" & {Alt Text} & "'>"
Then in Softr, in your List or List Details block, add a field of type Text, and for its Content, select the “Img Tag” field.
That should do it.
I think this could work for multiple attachments in a single field in a given record, but would require a more interesting formula in Airtable.
WARNING: It’s unclear to me whether this approach will continue to work much longer. If I am reading this Airtable support document correctly, this approach should have stopped working on November 8. However, it still seems to work. I can’t tell whether that means it’s about to stop working, or if it’s actually not affected by the change.