The .aep file deliverable needs to be in Adobe After Effects CC 2018 (15.0.1) format. The project cannot use any non-standard plugins for effects, expression handling, or other; it can not have any dependencies on third-party functionality at all.
There has to be one .aep file for every aspect ratio that you want the template to be used for; we treat every aspect ratio as a separate design exercise to guarantee the best output possible for every format.
If you provide us with designs for more than one format you need to inform us of that (more on that delivery below) so that we can build the Video Studio templates in such a way that the user can convert between aspect ratios and keep the data for the custom template.
For 1:1 compositions here are the composition settings, disregard the duration settings in the image:
• Technical format: Version CC 2018
• No plugins (not even for expression curves, for example, Ease and Wizz. But Motion 2 generated curves are OK.)