Pour the data retrieved from the DB into the dropdown list in the list search screen!

I have a main table PurchasePartsUnofficialOrderDetail that is using datagrid to display the list. But do not use search default data but use microflow as search function. But the problem is that I cannot get data from the Supplier_M table to pour data into dropdown search. (If you use search datagrid, data is available).  Can anyone guide me to get data from Supplier_M table? Thank you very much!   Table PurchasePartsUnofficialOrderDetail    Table  Supplier_M  Table PartsUnofficialInquiry_Overview_DataGrid   Datagrid seems to support retrieving data  Not getting data   File Overview_DataGrid_Create
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