Steve, you will find editing using an iPhone not as good as using a video editor. They can cost a fortune, but the one I use is an open source free one. Have a look at OpenShot. I do not use a lot of the features, so will be plenty powerful for you to try.Hi.
Great filming, just watched it all. Some great drone footage. I’ve made one of my trip thru Crinan round to Mull. Slightly different style to say the least. Might make you cringe. Edited it on my iPhone.
Steveeasy