its seems to be the easy part

1. clik RDC but dont connect first
2. click Options > Local Resources > see Local diveces and resource click "More"
3. You pick any source you want from HDD,flash drive, or mmc and then click OK

thats its now you can Connect to RDC like usuall. see what Drive has connect to your RDC.

if you want to download or upload to your RDC or PC just copy paste the file and its works like download and uploading file. takes time depend on your net speed