Flexible Upload of Data for several periods/years

Hey Colleagues,

my client wants me to develop a new functionality to upload data for several periods/years. The function they are using right now and correctly is the flexible upload.

As we have already developed several custom tasks and enhancements/modifications we try to not modificate further SAP standard or to post directly (back-door solution)

But:

It is no problem to start the flexible upload for different selecitons and to provide the values in an excel sheet. But I have problems to avoid a popup for selecting the excel file. It would be no problem if for example Batch-Input would work here, or if we would post directly using standard functionality (posting method with data change) but in this case we try to use the flex upload.

Has anyone experienced a similiar problem? Can we use the flex upload with suppressing the popup to select the file WITHOUT an enhancement?

Thanks in advance for your help,

Yavuz