Macbook Air photos app iPhone photos import issue

Try using the app Image Capture that's in your Mac's Applications folder.

IF that doesn't help, try are these:

• Restart the computer (of course)
• Re-start in Safe Mode. This bypasses certain potentially disruptive processes. Safe Mode is different for different computers, so see this: 

           Start up your Mac in safe mode - Apple Support 

Those are the most important things to try. Then try these:

• Use another library if you have one, or make a small test Library with a few pictures in it and see if the same thing happens. You can create a new Library by closing Photos and then option-clicking on the Photos icon.
• Make a new user and see if the same problem recurs with it
• Rebuild your Photos Library--close Photos and re-launch by option-command-clicking the app icon.

The idea is to find out if the problem is with the Library, with your account, or with caches and login items, and stuff like that. One of these steps may fix the problem, but their failure to work also helps figure out what's happening.

erayozgur wrote: … I have my samsung SSD T1 also not to have issues for fast import, same problem...

Then we need to ask,  how is your SSD drive formatted? To avoid damaging the Photos Library an external drive must be formatted in either APFS format or Mac OS Extended (Journaled) format. Additionally, the drive can not have had Time Machine on it since it was formatted. There have been so many problems with using incompatible drives that the newest macOSs won't even allow a Library on a non-Mac formatted drive to open, since there is a chance of damaging the Photos database. See this:

Move your Photos library to save space on your Mac - Apple Support

erayozgur wrote:

I tried all these tbh, still same problem remains..

What does "tbh" mean?

If you have installed and run any of those apps on your Mac remove them according to the developer's instructions. They are not needed and, more likely than not, are detrimental to the Mac's performance.

How much free space do you have on your MBA?

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?