Loading accdb file using for each loop in to single target table

Question

I have 3 accdb file as below in single folder, in control flow I have created a for each loop to loop through all the below file.  In dataflow task I have created oledb source using connection manager to point to first file a1.accdb. I am trying
to load all the file into single below mentioned target table, here It is only loading first file it is not looping through other two file.
This I have tried to load .txt files and csv files it is working perfectly but similarly when I try to load access db file table it is not working, can any one of you help me?
1. a1.accdb contains only one table  a1tab ( col1 col2 col3 )  
2. a2.accdb  contains only one table  a2tab  ( col1 col2 col3 )
3. a3.accdb  contains only one table  a3tab   ( col1 col2 col3 )
I have a target table with similar structure as source
Target table <TargetTable> Col1 Col2 Col3
aak

Answer 1

Thanks Arthur, please find below response
How do you handle the different table names?  Cant we handle it in a similar manner, how we handle the .csv/.txt files with different name and similar structure for sources(multiple files) and target (single table)
Is it good to drop the idea of for each loop and create a separate task for each accdb file? to be loaded to same target table( performance wise etc.. any justification would be helpful)
You must handle the connection string dynamically?
Can you help me with the logic for handling connection string dynamically
aak