# In depth outline of collection artworks folder
Follow information below to further understand the components of your "Artwork Folder".
1. Inside your **media** folder, there must be the correct number of artworks you intend to upload as part of your collection. It is essential to ensure you have placed the correct number of artworks in your folder because once you have created your collection, the number of artworks **cannot be changed**.
2. These files must be formatted correctly and numbered 1, 2, 3 and so on. Ensure there are no hash mark (#) in the filename.
3. Optional - A single **.csv** file containing your collection’s metadata. Below is an example of what your .csv file look like:
Name
Description
Media
Thumbnail
attribute [attribute name #1]
attribute [attribute name #2]
NFT #1
1.png
1.png
NFT #2
2.png
2.png
NFT #3
3.png
3.png
NFT #4
4.png
4.png
4. Optional - A **thumbnails** folder. If you are using non-image media (audio/video) for your drops collection, you can use a ‘thumbnails’ folder to upload images for marketplaces to display on list pages. By default, they will match on the filename (e.g. media/1.mp3 will link to thumbnails/1.png).
By fulfilling all above requirements, your artworks folder is now suitable to go!
