Creating a new record in externally sync'd table

I'm running into the same problem. I can create a new record in synced table manually, but the Create Record automation action insists it can't use that synced table because it is "synced from an external source."

I can create new records in my synced table, but the automation is convinced it cannot.

Having the same issue here, would love to know if there's something simple I'm missing or need to create a workaround.

Same issue here. I reckon it's a limitation - kinda ruins the usefulness of synced for me. So much for upgrading to business....

I ended using Make to create the new record - annoying to have to go outside AT for something simple, but it did the trick 😊

Running into a similar thing where I'm getting an error when I try to use a synced table in a separate interface. I cannot toggle on "Add records through a form" or "Link/unlink records" because I get an error that users can't link/unlink existing records because this table is synced. I've got the syncs set up to allow for edits, but I guess it's a limitation, which is too bad. 

I’ll try to throw some light into this.
In airtable docs “Create record Automation” in the FAQs section, it says

Can I use this automation to create records in other bases?

In general, no. To create records in another base you'll need to use a scripting action that includes a custom Web API call to create those records elsewhere. The one exception to this rule is for Enterprise customers who are using Airtable's two-way sync feature. In this case, creators can build an automation that creates the records in that synced table. These created records will sync to any other bases connected via that two-way sync.

But if you go to Airtable's two-way sync feature it says is available starting at Bussiness

Plan availability

Business and Enterprise Scale plans only

So I guess Creating records in other bases through automation is ONLY AVAILABLE for Enterprise customers.

Sad…. ☹️