A note export to Spark mail does not work.
Neitehr note nor PDF export.
This is best to take up with the support of Spark as we use the standard Sharing possibilities of the system and it works with other app.
Regarding the clickable URL, we are looking into this as it might have finally changed for iOS14, but so far this has proven to be complicated due to how this was previously causing sync issues. See URL field and Reminders