I'm trying to upload a vector layer to my Garmin GPS unit. I've saved it as GPX (WGS 84); opened the GPS Tools dialogue in QGIS 1.8; selected the "Upload to GPS" tab; and clicked on the "Data layer" dropdown arrow. However, the box just turns blue; nothing appears for me to navigate through. Nor can I enter anything into the box. It just turns blue, but will not take any input.
Any idea how I select the layer to upload?