Having played around with this attempt at producing something that ought to work a lot better than it does, I can only say that I was deeply disappointed at both its limitations and the crudity of its operation.
Granted: allowance must be made for an app whose interface is already rendered less precise through the use of a touchscreen interface.
Amongst many things - and which had originally attracted me - I found the mask-making layer system to be conceptually interesting but practically of little use when it came to making even a simple mask.
To me, this app is pretentious beyond its real capacity - and, whilst it will naturally never be able to compete with a desktop equivalent (being not, anyway, designed to do so), its attempt at achieving a promise beyond its overall capacity to deliver, frustrated me beyond measure.
That said, at the price, if you want to try it - and maybe find something useful in it - its not going to break the bank.
Nevertheless, to me, This is typically the kind of app whose creator should find a way to offer it free "under trial" - so as to allow people a chance to play with it and determine its appropriateness prior to purchase. Simple enough to do: "save" function with a watermark.
djinnphiz about Laminar Pro - Image Editor, v1.9.7