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If only a limited number of similarity reports have yet to be generated, it may be that the student/students uploaded a file type that is accepted by Moodle but that is not on Turnitin’s list of approved file types. The submission will still be accepted for the assignment but no similarity report will be generated. You can pre-empt this by limiting submissions to only the file types allowed by Turnitin.
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For a list of both supported file types and incompatible file types and formats, please see Turnitin’s File requirements page.
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Although PowerPoint files are supported, there are instances where Turnitin cannot generate a similarity report because it cannot read the text:
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