2 Mac can not see each other via airdrop under the same airport/timecapsule.

I have 2 iMac in my home with a TImeCapsule (gen4).
The wifi is on both 2.4G and 5G with the same SSID.
iMac A is working on 2.4GHz, iMac B is working on 5GHz.
So they can not see each other via airdrop, meanwhile they can see each other  in the left panel of Finder.app
Is it a known issue of AirDrop?

Hi Kirby Zhou,
Welcome to the Apple Support Communities!
It sounds like you would like to utilize file sharing between computers, not necessarily AirDrop. Please refer to the attached article for information on the file sharing process. If this is not what you are looking for, please let me know. 
Share your files with other Mac users - Mac Help
Best regards,
Joe

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