Fiio X7 - How to connect the X7 Line Out to other equipment?; The X7 does not get detected by my computer for file transfers?

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Q: How to listen to all the music folders on the X7 one by one without switching folders manually?
A: Play settings->Play through folders may be set to On to set the X7 to skip automatically from the last
song in one folder to the first song in the next folder when playing from a folder listing.
Why do the songs I’ve copied into the X7 not appear in any listing (except
Folder view) in FiiO Music?
A: Please go to FiiO Music Settings->Scan for songs to index your songs into the listings.
How to connect the X7 Line Out to other equipment? What to connect it to?
A: First, make sure that the Multifunctional Output (Section F.1.6.c) is set to Line Out. Then connect the
LINE/COAX OUT port on top of the X7 to the line in / aux in port of your equipment via an appropriate
interconnect. The Line Out is a standard high level line output and is for connecting to line inputs such as
that on headphone amplifiers, AV receivers, loudspeaker preamps, powered speakers, etc. The default
line output level is high (2V) and can damage headphones. In any case, headphones are not meant to be
connected to a line output and will perform poorly.
The X7 does not get detected by my computer for file transfers?
A: The X7 may be connected to the computer as a standard USB storage device or as a DAC (for outputting
audio being played by the computer). Disconnect the X7’s USB connection, pull down the settings menu
from the upper right of the touchscreen and check that the USB connection is set to “storage” rather than
“DAC”; then plug the X7 back in. You will be prompted to “Turn on USB storage”. (the prompt can also
be brought up manually by pulling down the notifications panel from the upper left of the touchscreen and
tapping the “USB connected” notification.)