Asset previews

You can see a preview of the contents of many types of data assets and some types of analytical assets in projects and catalogs. For data assets from files, only files with specific file extensions and mime types have previews.

The content you see in a preview depends on the type of asset, file, or data.

Relational data, CSV, Avro, partitioned data files, and Parquet files
The preview includes column names, data types, data classes, and a subset of rows of data. Data classes identify the type of content in the column. Data classes are inferred automatically as part of the asset profile. For connected data, you can see when the data in the preview was last fetched from the connection and refresh the preview data in projects and catalogs by clicking Refresh.

Data connections marked with a key icon (the key symbol for private connections) are locked. If you are authorized to preview the data source, you are asked to enter your personal credentials the first time you select it. This is a one-time step that permanently unlocks the connection for you. See Adding connections to projects.

PDF, text, and images
The preview shows the whole document.
Microsoft Excel documents
The preview shows the first sheet.
Folder assets
The preview shows the files and subfolders, which you can also preview.
Notebooks
The preview shows the whole notebook.
Models
The preview shows information about the model.
Dashboards
The preview shows a snapshot of what the dashboard looks like. When you select to publish a dashboard to a catalog, you can choose to add screen captures of the dashboard with the dashboard file to the catalog. If a snapshot of the dashboard was added to the catalog, users can preview the snapshot before adding the dashboard from the catalog into another project.

If you see shield icon a shield icon next to the column name of a relational data asset, it means that the data in the column is masked by a policy. Policies can mask data by masking the original values with similarly formatted values, or by substituting the values and format of the data with meaningless values. Within a catalog, the owner of the asset is not affected by policies and always sees the original values. Within a project, all project collaborators see the asset the way it looks to the person who adds it from the catalog.

File extensions and mime types of previewed files

These types of files that contain structured data have previews:

Extension Mime type
avro  
csv text/csv
csv1 application/csv
json application/json
parquet  
parq  
txt text/plain
xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
xlsb application/vnd.ms-excel.sheet.binary.macroEnabled.12
xls application/vnd.ms-excel
xlsm application/vnd.ms-excel.sheet.macroEnabled.12


These types of image files have previews:

Extension Mime type
bmp image/bmp
gif image/gif
jpg image/jpeg
jpeg image/jpeg
png image/png


These types of document files have previews:

Extension Mime type
html text/html
pdf application/pdf
txt text/plain