It sounds like the “blinking animation” you’re encountering is a feature known as Spring-Loaded Folders, which has been a part of macOS since the 90s. It’s int

It sounds like the “blinking animation” you’re encountering is a feature known as Spring-Loaded Folders, which has been a part of macOS since the 90s. It’s intended to make it easier to move files and folders around without first opening a window for the destination. If you hold the dragged file over a folder a moment longer, the target folder will open in a new window where you can either drop the file or navigate more deeply by repeating the process. To avoid this behavior, drop dragged files in the destination folders before the spring loading triggers.