Hi all,
I believe I have the best solution for this. We use a system called Insycle. I have mentioned it before but it is a plug and play app in the Hubspot store. We run all our uploads through the system which will be able to do almost any of the data management you want (including appending) and we have a referral arrangement with them.
If you sign up with our link you get a 10% discount. Plus there’s a Free 7-day trial with no credit card required. I’d highly recommend giving it a go. You can sign up here: https://www.insycle.com/manufacturer
They’ll also help run you through the system.
@Jems212 @kristen_sb et al