I did installed my ubuntu in SSD and attach HDD for storing regular data, but i can't create either any folder or paste anything in my HDD. i am in dilemma... 
5 Answers
It is probably a permissions issue.
Have you tried to create a new folder using the command line?
sudo mkdir new_folder
If this works, the problem is the lack of permissions.
You will have to give permissions to your HDD:
chmod u+rw path_to_hard_drive
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This Problem is probably due that you've Dual Boot, the windows OS still opened
To Handle this problem, you have to shut down the Windows OS by executing this command on CMD
shutdown /s
Or Another Way, you might use the Power Option to deactivate it Hope this will work for you
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If you have dual boot, in my case are Windows 10 and Ubuntu 20.04
your Windows OS might hasn't been completely shutdown.
You can read this article :
2 ways to perform a windows full shutdown :
https://www.isumsoft.com/windows-10/2-ways-to-perform-a-full-shutdown.html
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$ sudo nautilus
Other Locations > Select drive that you wanna access > Right click > Properties > Permission
There change the Owner and group to your username, also check the Access it should be "Create and delete files"
Did you open problematic drive in Windows before the issue? If so, try ntfsfix.
Find a drive device name:
sudo fdisk -l
Unmout drive from nautilus. Then fix it:
sudo ntfsfix /dev/sdc1
Mount the drive again.
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