How do I make a volume or a multi-tier bundle discount (e.g. 10% off for 5 products, 20% off for 10 products)?

1.) Best option (the recommended way):
Yes, you can easily create a multi-tier or a volume discount bundle. Just create a new bundle in the app and select the Volume discount type. This will allow you to set up different discounts for different tiers.

2.) Alternative option (use this only if the first option isn't what you want to achieve):
The other way to create a multi-tier discount would be to create a bundle for each discount. In each bundle, pick the same combination of products, but set the correct quantity for each product and set the correct discount.
And because you are creating bundles with the same product combinations, you have to make sure the bundles have the priority configured correctly. The bundle with the highest number of required products should have the highest priority.
The bundle with a lower number of required products should have a lower priority and so on.