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The Preview feature, when enabled allows displaying the user file list in Thumbnail View mode, for most popular image, document and video file formats.For documents, a thumbnail image of the first (usually title) page is rendered, for videos, 10 slides evenly sampled along the duration time.

Prerequisits:
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Thumbnails generation relies on widely used free 3rd party conversion utilities. CrushFTP renders the thumbnail list, but it doesn't include no native media conversion code to generate these, except the conversion scheduler. This latter we call the Preview Scanner component. The required external media conversion utilities are either part of the host operating system (in case of Mac OS), can be downloaded from the OS apps repository ( Linux yum and apt), or as a standalone package from the maintainer's site (Windows, all OS). In case of Windows and Linux the conversion utilities need to be deployed manually.

Image and document files:
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On Linux platforms need to deploy GraphicsMagick for image formats and also Ghostscript for documents. On Debian based platforms the packages are readily available from the apt repository On Red Hat/CentOS and usually other RPM based distros, can be installed from the EPEL repository. Download the latest epel-release rpm from Install epel-release rpm: Install GraphicsMagick the package: Alternatively, can try to use ImageMagick still, the v6.x version line if available, is stable. The v7.x version line however may not be. Ghostscript has been on all major Linux app repositories for long, can simply install it like On Windows platforms will need to user GraphicsMagick mandatorily, for the recent versions of ImageMagick will not work with Java no more. There are options, either use the binary installer, or use the portable .zip package and deploy it somewhere.
External links to maintainer's download page

GraphicsMagick http://www.graphicsmagick.org/download.html
Ghostscript https://ghostscript.com/releases/gsdnld.html

On Mac OS platforms usually don't need to do nothing, the conversion utility is readily available, need to use the qlmanage preset, it will work out of the box.

Video files:
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On Linux, need to install ffmpeg from the official app repository, depending on the distro, with apt, yum or dnf, like
On Windows need to download from the maintainer either the binary installer and run it, or the portable .zip package then unzip it somewhere on the host. External link to maintainer's download page:

FFmpeg: https://ffmpeg.org/download.html

On Mac OS platforms usually don't need to do nothing, the conversion utility is readily available, need to use the pcastaction preset, it will work out of the box.

EXIF data (optional):
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We can display additional information under the thumbnails on hover, if exiftool is deployed. It's not a mandatory component, but if needed, on Linux can install it from the apps repository, on Windows, download the binary from https://exiftool.org/, drop it into the GraphicsMagick binary's parent folder. On Mac OS, need to download and install from the dmg package.

Setting it up:
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Once the prerequisites are fulfilled, choose the appropriate preset from the Conversion utility presets dropdown list.


In some cases the automatic Working directory path may be inaccurate, in that case, use the right side Browse button to locate the installation directory of the media conversion utility.


Then in the lower half of the Preview config page, use the Add folder button to browse for the user data directory to be processed by the Preview Scanner. This usually is the top level directory of all user VFS data directories.
Holding down the Alt key while click the Add Folder button allows adding remote items (FTP://, SMB3://, etc.)

So the top half of the window in general you don't touch or change anything. Just use the preset menu. The bottom half of the window, you specify directories that CrushFTP should monitor for new files. When it sees a new file, it generates a thumbnail for that file.