When you create a new presentation in PowerPoint for the web, the very first thing you do is name your presentation.
Important: When naming your file, don’t use the following characters: \ / : * ? < >
Using OneDrive:
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On the OneDrive menu bar, click Create > PowerPoint presentation.
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Enter a file name, and then click Create.
Using Microsoft 365 OneDrive for work or school:
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On the Office 365 menu bar, click OneDrive .
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Under Documents, click New Document , and then click PowerPoint presentation.
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Enter a file name, and then click OK.