When adding elements to a table from within a form, the elements appear in the table. However they are not saved until you save the form. This closes the form, and if you want to add new elements, you need to reopen it.
If you don't save and for any reason have a pause, a connection interruption, or close the tab accidentaly, you lose all.
This possibility to create records linked to the form (kind of like notes respons documents) is a big advantage of VOLT. However, the handling is clumsy because of that.