To help, you'll need to investigate different VPN offerings for those remote connections, and potentially work with your IT professional to implement quality of service (QoS) on your network that'll protect the bandwidth used by video conferences while they're happening. If you're already using a cloud PBX-based voice over IP (VoIP) system for your phone calls, your IT people will already have a good idea how to protect traffic this way as the requirements are very similiar.
KineMaster is one of the most powerful video editor apps available. You can do the basics like most of these other video editors can. However, this one includes multiple video, image and effect layers. Additionally, there are audio filters, chroma key (for your green screen fans out there), various video effects, transitions, and more. It's not as powerful as a full desktop editor. However, this gets much closer than most other competitors. We would recommend this for actual video production (at least for stuff like YouTube). You can use it for free in trial mode for a while. However, you'll need the $4.99 per month subscription to get everything forever.