Yes this path is wrong actually. To get exact path you can use below step by step adb commands
1. adb shell – Get shell on target device
2. ls –l | grep “storage” – List files/directories with name storage
3. cd storage – Changed current directory to ‘storage’
4. ls –l | grep “sdcard” – List files/directories with name sdcard
5. pwd – See current path, this is remote path from where u r actually uploading myfile.pdf