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Engineers are currently investigating the issue.
The more rows an xlsx file has the further the docviewer preview will zoom out until the content is unreadable.
Even if the content would fit within the width of the page the length seems to have no upper limit (or an insanely high one) for scaling the documents proportions for the preview.
The file preview for xlsx files with many rows should not be scaled down so far that none of the content is legible.
No workaround exists at this time.
Upload an xlsx file with thousands of rows to canvas
file above has 20,000
Wait for docviewer to render it
Find your glasses
FOO-5188
Known issues indicate notable behaviors that have been escalated to the Canvas engineering team. Known issues are not a guarantee for an immediate resolution. This document is for informational purposes only and does not replace the Support process. If you are encountering the behavior outlined in this document, please ensure you have submitted a Support case (per your institution's escalation process) so Canvas Support can adequately gauge the overall customer impact and prioritize appropriately.
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