It is possible to populate a managed table directly from an access database, these are the steps.
1. Create a new action step by right-clicking on a group and then selecting "Add action step":
2. Under "Manipulating Data" select "Multiple file manipulations" and then click on "Add the selected step to my process":
3. Add a new instruction search for "convert". Select "Convert to SQL table":
4. Configure the Convert to SQL table. Select the Access database and table you want to import into the managed table.
Tips and tricks
Remember, the structure, i.e. the number of columns and data type, in both tables must the be same.