Mention that env var FORCE_LOGIN should be off for this to work ?

[vviers]

I might be wrong here since I haven't tried the form itself, but while trying to follow the README instructions on our dev instance (which has the FORCE_LOGIN env var set to true), this step (

grist-form-submit/README.md

Lines 86 to 89 in 3ffd2a1

	Don't worry, the rules in the previous step will not allow the public to see anything in your
	doc, only to create records in one table. But just in case, you should confirm by opening
	your document in a private window. There should be no error opening it, but it should look
	empty.

) did not work for me.

I have opened a separate issue in grist-core regarding the interplay of FORCE_LOGIN and public sharing :)