Check the screenshot, See the upper URL Bar and Notice that it is file:/// whereas your are using file:// , you are using double / instead of triple ///.
Try changing your Path like that and then try it again.
EDIT : it’s Confusing that your Blocks Image is Using file:// where as your screenshot lable shows file:/// and You Error Notifications at bottom is showing file:/
i only use a lable to see exactly the path .
i test all of ways , with one slash (/) , also with two slash (//) and with 3 slash (///)
all of them are same problem and same error !
if u can please make a simple app with FTP component . and give it to me . tnx
here i make 4 button
btn0 : send file without any slash , direct selection from image picker
btn1 : send file with this format : file:/XXX that XXX is selection of image picker
btn2 : send file with this format : file://XXX that XXX is selection of image picker
btn3 : send file with this format : file:///XXX that XXX is selection of image picker