I created ics file by plugin “ICS Maker”. They have good demo page:
https://d39.bubble.is/site/equina-playground/ics_maker

but I can’t send it by Postmark pluggin
I have two and in both I have a problem how to attach it:
Step 1 (File has been created and I have it in table “ICal File” in column “file” type “file”

and I would like attach it to postmark mail:

first pluggin:

image

second: