The buttons from left to right are: New Project, Open Project, Save Project, Undo, Redo, Import, Export, Preview, and Share.
New project, used to create a new project, click to open the new project dialog
Open project, used to open an existing project, system will open its specified file dialog by clicking it.
Save the project, if the current project has changed, the save project button will light up. Click to save the current project. After the projects is saved, the save button will be darkened.
Undo is used to undo the last time edit operation.
Redo is used to redo the last time undo edit operation.
Import is used to import a supported project file format, click to open the import dialog.
Export is used to export project, click it will pop up export dialog.
Preview is used to preview the running effect of the animation in the browser. If your project contains multiple animation clips, you can switch it by left clicking in the browser.
Work sharing, open work sharing and uploading page.