There is an awesome plugin WP Download Manager, which allows us to upload and manage files in a very comfortable way. But unfortunately, it has no deep file search functionality.
This WPFTS add-on plugin makes a “bridge” for WPFTS to let it understand WP Download Manager’s files and implement the search on them by content.
Changes in 1.10.24
Added support for WPFTS Pro v3.x+
Fixed in 1.8.18
Improved local file handling
Fixed in 1.7.16
Improved cache update when saving a WPDM post
Added in 1.6.14
Improved compatibility with WP Download Manager Pro 6.1.2
Added in 1.5.12
Improved compatibility with WP Download Manager Pro 6.0.8
Added in 1.4.11
Improved compatibility with WP Download Manager 3.2.15 (free) and WP Download Manager Pro 6.0.7
Improved compatibility with WPFTP Pro 2.46.180 and WordPress 5.8
Added in 1.3.6:
Improved compatibility with WP Download Manager 3.1.0.9 (free) and WP Download Manager Pro 5.0.8.
Added in 1.2.1:
Special tags which you can insert to File Pages to show extracted text (may be used for Google Indexing or file previews).
[wpfts_dm_rawtext]
Will show extracted file content without any formatting or escaping
[wpfts_dm_rawtext_esc]
Will show extracted file content with htmlspecialchars() escaping
[wpfts_dm_rawtext_pre]
escaped and wrapped by pre tag and class="wpfts_dm_rawtext_pre"
[wpfts_dm_rawtext_div]
escaped and wrapped by div tag and class="wpfts_dm_rawtext_div"
Please refer WPFTS Add-on for WP Download Manager Documentation.