Why can't I transfer any files to an external device?

My MacBook Pro will not let me transfer any files to my external hard drive or android tablet. I can transfer from the device to the macbook but not the other way around. I used to be able to as I have transferred movies from the macbook to the hard drive before but it will no longer allow me to do that. I have downloaded the android file transfer app. How do I fix this?

The external HDD is probably formatted NTFS, for Windows, which allows you to read but not write to it.  Click on it with COMMAND + I and check the format.
You can reformat it for Mac or PC and Mac, but reformatting will erase all user data off of the HDD.
You also can use a third party software such as Paragon or Tuxera to write to it.
Ciao.

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