Unable to transfer media files form computer to phone

Ok my guess is that ur boyfriend has deleted the phone memory using the master reset umm on the left side there is a plastic slip flip it open and u have a memory card in there (depends how much the phone was (if it was cheep it wont) u should of got a little gray and blue card thing put ur memory card in the gray and blue card and if u have a card reader put it in the part where u put ur SD card in and it should come up as phone card i recommend not 2 use the cord because it is stupid

i hope it helps

Simply put, MobiKin Assistant for Android or Assistant for Android (Mac Version) is a free downloadable mobile manager tool that enables you to manage, backup, export/import, delete, edit, restore not only media files like photos, videos, and music, but also text messages, contacts, apps and other mobile contents. It can not only transfer media files from Samsung Galaxy S8 to computer, but also can help you to text and even manage your contacts while your device is connected to your computer. You can group text from computer to family and friends with the same message with ease. You can also reply to messages right from your computer. Using the application, you can also add new contacts to Android, delete old contacts and edit existing contacts on Android phone.

https://www.mobikin.com/android-backup/transfer-media-from-galaxy-s8-to-computer.html

But have you ever worried that what if unexpected accidents such as mistaken deletion or virus infection lead to the whole data loss? What if the increasing number of media files (photos, videos, music) gradually erode the storage space of your Android device, until to none? Are you willing to delete the old memories to save new or directly give up saving new files? And that's why you need to transfer media files from Android phones to computer and save them as a backup. Then you absolutely can't miss this Coolmuster Android Backup Assistant, which allows you to easily and quickly back up media files from Android phones to computer, regardless of the file quantity. More importantly, this software offers you more than this. You can also use it to backup other files like contacts, messages which can't be easily accessed without a professional third-party tool.
Easily Backup Media Files from Android Phones to Computer

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