No worries 
If the item (or items) are used to create some video footage (incorporating your logo/branding, animation effects etc) that will be used unchanged at the start of each video, that’s fine - that logo reveal would be considered a single End Product, and can be used to introduce all the videos in your channel.
If the logo reveal is modified each time (for example, if you create new versions that incorporate the title of the video it’s added to) then each of those versions would be a separate End Product.
The Envato Elements licence terms have a few differences, but for your purposes you’re still looking at using the item to create a single End Product. This would need to be created while your subscription is active, but it can continue to be used on your channel videos after your subscription ends. What you wouldn’t be able to do is use the item to create any new End Products with that item after your subscription ends.