Battery blink red led when us powered!

i copy files hiearchy to a nas using wifi and my android like à tempory hard disk (sd card) because transfert file beetween 2 ftp server seem not available on android market.
1- Does android ftp to ftp apk exist is available in google market ?
2- why my device has 2 blink led ? does it mean copy/ transfert file using wifi ftp need more power that thé ac outlet could give ? if the device is not powered i undestand that status power goes for power led from blue green …to red . But here the device is powered using usb … so power led battery status should stay green !!!

3- i have also a hiearchy issue since i have many nested directory ! i think the limitation comme from microsoft type partition !! is there à way to copy instead reading the pop up " error reading file!" in totalcommander
4- Is there limit duration for ftp session ? sometime i nées tout reconnect to continue ftp session !

Thw complete downloadable user manual for the device explains what all the LED lights indicate.