Thanks for reply ..I will check it

Ok now I’m in love .....

but for the truth you should put a note window that’s warring you what’s should do .... or put the options together 

Sorry if there is a tutorial to how to activation  the button  but  it seems for me it doesn’t working  actually  the grid settings  doesn’t give me any effect   

All the tools in procreate (sorry still I had trouble with upload photos)
1 .. drop colors directly from your   color review to any liner "must be closed shape"to made it fill ...it’s the same "bucket fill" ...the difference it’s direct from color
2... the second is "alpha lock layer "{{the same in procreate app }}to focus to the shape you draw without any mistakes ...and any effect it will be into the shape

There is a step that he makes a layer by ‘curve connected with  mask(it should  inverted to black)’ over the clouds-ship group and he  used burn tool or doge tool to create deeps and details shadow and light ...I can give curves for saturation  ..or for dark tone ..but how to made it curves effect connected with black masking and burn or doge on the black mask   

If you watch the video you should understand "this step" 
Again sorry I should put photos (for example) but unfortunately your forum can’t expect any photo to upload

As in the title if this possible to made channel editing for colors "red.blue ..green" (in layers sections ) as in photoshop
It’s very helpful for masking..selections...etc ..

Yep ..After hours and hours on Artstudio pro for iPad Pro (the most app looking like photoshop) ...I did this multi photo editing with more than 30 photo the app looks great and it’s very nice for ipad.... yes ..it’s not photoshop but it did great editing and easy all tools looks like photoshop no needed to learn curve... Again I did it jut for testing the iPad with this app

.one more thing i don't know how to make high resolution finshing in this app ... I must discover the app.. So ..is the app recreate the photos to made it small size or small resolution when you working ??