I saw a question today inside a linkedin forum about how to import files and folders into a Domino database and there are several ways on how to do this. Check out these three ways of importing files and folders into your nsf file.
1. Import the files into the webcontent folder using package explorer. using import
Select general -> file system to import files and folders
Browse for the from folder, any subfolder will be the top folder when imported into web content in this case bootstrap
And then your files and folders look like this after the import
2. Enable the database for webdav then you can connect to the database using windows and upload the folder/file structure into domino. Super simple and quite easy to maintain. (Link to how to setup this or this old Codestore post)
3. Build an agent that will import the file resource using dxl check out this TLCC article in how to import using DXL.