I am migrating from Drupal 7 to Drupal 8 (8.6.9). Both the Drupal 7 and the Drupal 8 site currently run on my local machine. The migration of the public files goes well using:

source:   plugin: d7_file   scheme: public   constants:     source_base_path: 'http://www.oldsite.com/' process:   fid:     -       plugin: get       source: fid   filename:     -       plugin: get       source: filename   source_full_path:     -       plugin: concat       delimiter: /       source:         - constants/source_base_path         - filepath     -       plugin: urlencode   uri:     -       plugin: file_copy       source:         - '@source_full_path'         - uri ... destination:   plugin: 'entity:file' migration_dependencies:   required: {  }   optional: {  }  

The private files are not found using the site URL as source_base_path so I switched it to /absolute/path/to/private. However, the files are still not found.

When I check the migration messages it says File '/absolute/path/to/private/filename.png' not found for each private file. However, if I copy the path and search for the file in the terminal, it’s there so the path is correct.

At first I thought it was due to spaces in the filename but it also happens with files without spaces. For completeness: there are no spaces in the path to the private directory.

Note: not all files are images, many are PDFs.

When searching for this problem I find configurations like above, so I’m out of options.