Problem don't saved product
I when want to create a product after fill the inputs and details when I click on add save product button, the success message shows me, but not saving?!
When You click on 'Add Product' ( https://prnt.sc/osg1kd ), you will get this form ( https://prnt.sc/osg0gm) then after filling it, you will redirect to edit form (https://prnt.sc/osg11n).
Fill all the details there & your product will be created.
If you are doing so & still product is not created then take pull from master branch & make sure that you didn't changes any core file.