CS Unity Tool

I am looking for a CS Unity Tool that is compatible with Unity 2019.4.31f1 that can help me with asset management. The budget for this project is $0 - $25, so ideally I am looking for a tool that is cost-effective yet also provides functionality for what I need. I already have a short base that works, but I would like additional functionality for ease of use such as the ability to drag in more than one animation at a time or the ability to drag in a folder and all animations contained there will be selected. Additionally, the current version I have does not scroll up or down, compressing all text to fit inside the box. This can lead to a block of black text caused by the compression of over 200 animations. Find attached the aforementioned script. This is a product I will be seeling free of charge on Gumroad, the link to my gumroad page is annaspanner.gumroad.com