Any content you post or upload will be stored in your vault. To make it easier to find and ogranise your content, you can make folders. By Default you will have folders ‘All’, ‘Images’ and ‘Videos’. To add more:
Navigate to your vault page
Click the folder icon in the top right of the vault
Name your folder and select ‘add Folder’
To add media to folders:
Navigate to your vault page
Select the media you would like to add
Click the upload icon in the top right of the vault (next to the bin)
Click move to folder
Select the folder you would like to move it to and hit ‘Move’