How do I download video/photos from the phone to pc? I have a data cable, but cannot get the things to transfer over?

It won't be difficult- MobiKin Assistant for Android (Win & Mac) can help you to achieve this goal easily.
It is a third-party desktop application, designed for Android users to manage the files like videos, pictures, songs, contacts, text messages, call logs and other files on the device. it is able to sync media files, contacts, messages, etc. from/to Android phone or tablets efficiently with One click.

https://www.mobikin.com/android-backup/how-to-transfer-videos-from-android-to-pc.html

According to the reviews, there are several major factors may lead to data loss from Android mobile phone, such as system crashes, virus infection, improper operations, and so on. Thus, it is very sensible to backup Android phone to computer before losing files from your phone all of a sudden. However, you are not able to easily save contacts and messages to the computer via USB just as you usually do to export photos and videos. That's because contacts and text messages are always stored on the internal memory of the phone or the SIM card, instead of the SD card where we often save media files. Then, if you want to completely backup the whole files on your Android smart phone to the PC, you should turn to an assistant program.
My recommendation is Coolmuster Android Sync Manager, which helps users sync Android phone to PC with just a few simple clicks. It supports to copy contacts, SMS messages, photos, videos, apps, music, books and various documents on your Android device. In addition, this program allows you to preview the details before exporting. So that you can choose to transfer the whole or part of the files as you want. After marking your needed data, you are able to sync them to your computer in batches, which can be pretty time-saving.

Best Tool to Sync Android Phone to Computer PC

Actually, it's easy to transfer videos and photos from lg phone to computer. You just need to connect your lg phone to computer via usb cable, start the android assistant tool. A short time scanning later, you can directly transfer videos and photos to pc.
LG File Transfer How to Copy Data between LG and Computer

Welcome to Fixya.

Here are my recommendations for a successful data transfer from phone to PC and vise versa :

• Ensure that the memory card is installed in the phone and set it as primary storage instead of the phone's internal memory.
  
• Connect the phone to the LG data cable and the other end goes to the computer's USB port.
• Do not use the LG Suite for this as the computer will recognize your phone's memory card as external drive. If LG Suite is installed, you may delete it first then move back to step 1.