I exported a new table from backend to frontend and it isn't linked to backend

The screenshot is from frontend, I exported a table 1 from backend to frontend, and it is not connected with backend. Table 2,3,4 and, 5 are linked when I splited the database.

I don't know how to link the new table. Help me...

I tried to use 'saved Imports' from frontend and the result is the same.

Im using Office 365