Copy selected files between 2 Synology

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You can use Synology's Cloud Station ShareSync to synchronize specific folders or files between your two Synology NAS devices. This will allow you to keep both folders in sync, but also choose which files to sync.

Here are the steps to set up Cloud Station ShareSync:

Install the Cloud Station Server package on both of your Synology NAS devices.
On one of the NAS devices, create a new folder that you want to synchronize with the other NAS device.
Enable the Cloud Station ShareSync service on both NAS devices.
Go to the "Cloud Station ShareSync" app on the first NAS device and click "Create".
Select the folder you created in step 2 and choose the destination folder on the other NAS device.
Choose the sync mode and any other options you want, such as whether to sync deletions or not.
Click "Create" to start the synchronization process.
Once the synchronization is set up, you can choose which files to sync by simply putting them in the folder you created for synchronization. They will automatically be copied to the other NAS device. If you want to copy a large number of files at once, you can simply drag and drop them into the synchronized folder.

I hope this helps! Let me know if you have any other questions.