"missing payload" error on Grist API Upload attachments to a doc

Using Girst API for file upload. They have modules but not for file upload > using HTTP. Showing the trouble on video: :footprints::camera_flash: :link: *** missing payload error on Grist API Upload attachments to a doc ***

Grist API for file upload to doc

Same question posted on Grist forum

Jarek on Grist resolved the issue:

Heya @Tomas_Westerholm welcome to the community :wave:

Thank you so much for sharing the solution with us and for tying the two communities together! :pray: