Hi @Power-Tim ,
Could you please share a bit more about your scenario?
Do you add a Custom data card in your Edit form? Which type column do you use to store the Rich Text value in your SP List?
Further, do you want to submit the Rich Text value from the custom data card in your Edit form back to your SP List?
Currently, within PowerApps, we could not bind a Custom data card to a field in a data source (e.g. a SP List), and the SubmitForm function could not submit custom data card value.
Based on the needs that you mentioned, I think it is not necessary to add additional custom data card in your Edit form to collect data. Instead, you could enable the corresponding List field in your Edit form, then the corresponding data card would be generated within your Edit form.
After that, you could consider change the Original Text Input box under the List field data card into a Rich Text control as below:
Convert original Text box to Rich Text Box

then you could type your text within the Rich Text control, then press Submit button, the Rich text value would be saved to your SP List using SubitForm function.
If you just want to add a custom data card in your Edit form, and want to save the Rich Text value within this custom data card back to your SP list, I think the Patch function could achieve your needs. Please take a try with the following workaround:
Set the OnSelect property of the "Submit" button to following:
Set(EnteredRichText, RichTextEditor1.HtmlText);
SubmitForm(EditForm1)
Set the OnSuccess property of the Edit form to following:
Patch(
'YourSPList',
EditForm1.LastSubmit,
{
ListTextField: EnteredRichText /* <-- Update the Rich Text value back to Text field in your SP List */
}
)
or
Patch(
'YourSPList',
LookUp('YourSPList', ID = EditForm1.LastSubmit.ID),
{
ListTextField: EnteredRichText
}
)
Please consider take a try with above solution, check if the issue is solved.
Best regards,