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The Document Preview And Content Type. To create a custom site content type you always start from an existing content type. You can preview a file in a course or personal user file storage area.
File Explorer also has a related feature called Details Pane. To create a custom site content type you always start from an existing content type. When a text file is uploaded the content_type in the attachment object has charsetascii such as textmarkdown.
However if that doesnt happen a system-default file type detector is invoked.
2 the thumbnail and preview columns do not display the image in the Site Asset Image Library. The Site Asset Image Library has items of content type image. The new site content type inherits all the attributes of its parent content type such as its document template read-only setting or columns. Click the name of the file you want to preview or click the line item for the file 1 and click the View icon 2.