Airdrop Stuck & Photos Unable To Import

Frustrating.

I just recently (a month ago) bought a new iMac to replace my 2012 old iMac.

These are my new iMac specs:

AirDrop issue:

From iPhone X to this iMac, photos transfer using airdrop stuck at 'waiting'. Weirdly, no issue the other way round, from iMac to iPhone.

Photos App issue:

Photos App unable to import photos from iPhone.

– it did function normally before. But now it can't. Selecting only one of the medias from 'Devices' and then clicked "Import 1 Selected', it jumped to 'Import' with nothing happened.

– After experiencing the inability to import, I also checked the (earlier) exported photos' metadata, they're new copies, they're not originals; I have already selected 'keep original' when exporting.

– earlier when it can still function, I faced some lengthy amount of duration exporting a single media to external folder.

– iPhone unable to connect to Photos App using WiFi (can only connect via USB cable)

Objective:

I want to keep my medias (taken using my iPhone) on an external drive.

I want the metadata of the original media to remain intact.

I want to transfer via Wifi.

I want to also transfer files from iPhone to iMac using AirDrop.

I don't want to purchase an external app for such basic tasks.

How can Apple let me down on such functions?

Disappointed.

Note:

I've searched for similar cases (e.g. AirDrop troubleshooting), and tried all recommended solutions. Nothing worked. Photos App solutions as well, nothing worked. Blocked contacts in settings too. Nothing worked.

[Image Edited by Moderator to Remove Serial Number]