Not able to write on an external hard drive

I recently bought a external hard drive (Seagate) and formated that to NTFS. I used this to store files from my PC. Recently I bought my iMac, and when I connect the hard drive, it recognized it, but I am not able to transfer files from my iMac to the hard drive. Any suggestions on how I can achieve this?
Thanks

Mac can't write to NTFS formatted drives.
If the drive is plugged into a Windows PC, you could write to it via file-sharing with Windows, however.

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