Due to Android 4.4 limitation BTSync can't write data to other apps folders on ExtSD. So for now BTSync won't be able to backup anything staying behind his folder on ExtSD. We are looking for ways to change it in future.
I don't think this is the case. Dropbox is perfectly capable of identifying images on the SD card and copying these up to the cloud.
Beside hundred of apps read and write information to the SD cards..
Syncing Sd Card Camera Roll Photos From Android Phone To Pc Folder
in Sync Troubleshooting
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I don't think this is the case. Dropbox is perfectly capable of identifying images on the SD card and copying these up to the cloud.
Beside hundred of apps read and write information to the SD cards..