Godox V860III-C User Manual page 16

If the subject is too far away and underexposure, the < > icon will blink in the
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viewfinder. Move closer to the subject and try the FE lock again.
If <ETTL> is not displayed on the LCD panel, FE lock cannot be set.
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If the subject is too small, FE lock might not be very effective.
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High-Speed Sync
High Speed Sync (FP flash) enables the flash to synchronize with all camera shutter
speeds. This is convenient when you want to use aperture priority for fill-flash portraits.
Press Function Button 2 <SYNC> so that
< > is displayed.
If you set a shutter speed that is the same as or slower than the camera's
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maximum flash sync speed, <
With high-speed sync, the faster the shutter speed the shorter the effective flash
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range.
To return to normal flash, press <SYNC> button again. Then <
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Multi flash mode cannot be set in high-speed sync mode.
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Over-temperature protection may be activated after 15 consecutive high-speed
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sync flashes.
Check that <
viewfinder.
> will not be displayed in the viewfinder.
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> is displayed in the
> will disappear.