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Related Question (not answered): https://social.msdn.microsoft.com/Forums/en-US/b45a6cee-cc09-4820-9667-0af97f3030c4/cannot-upload-aspx-file?forum=sharepointdevelopment
Currently unable to upload .aspx files to the Site Page using Microsoft Graph. It doesn't matter if the file is empty or if it is a file with the content. Site Pages is a specific drive within the Site directory. Which mirrors the response above. If the file is named, .asp or any other ending for that matter, the file is able to be uploaded. This leads me to believe this is not a matter of permissions within the Azure portal.
Similar problems are experienced when trying to update template files within _catalogs/theme within Graph. Created a new question to address questions about restricted directories with Microsoft Graph. Any feedback on this issue would be greatly appreciated.
Hi @totally_gizmo,
I'm glad to hear that you solved the problem and thanks for your sharing. If you have any issue about SharePoint, you are welcome to raise a ticket in this forum.
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others." and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[Cannot upload .aspx file to Sharepoint Site Pages using Microsoft Graph]
Issue Symptom:
Related Question (not answered): https://social.msdn.microsoft.com/Forums/en-US/b45a6cee-cc09-4820-9667-0af97f3030c4/cannot-upload-aspx-file?forum=sharepointdevelopment
Currently unable to upload .aspx files to the Site Page using Microsoft Graph. It doesn't matter if the file is empty or if it is a file with the content. Site Pages is a specific drive within the Site directory. Which mirrors the response above. If the file is named, .asp or any other ending for that matter, the file is able to be uploaded. This leads me to believe this is not a matter of permissions within the Azure portal.
Similar problems are experienced when trying to update template files within _catalogs/theme within Graph.
Solutions:
Newly released within Microsoft Graph Beta API, there is the Site Page API that allows for the creation of a .aspx file.
It is a 2 part process.
POST /sites/{site-id}/pages, which returns the newly created site Page.POST /sites/{siteId}/pages/{pageId}/publishYou could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community member's to see the useful information when reading this thread. Thanks for your understanding!
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FYI: This Office 365 admin center > SharePoint admin center > settings > Custom Script > is no longer the path to get to custom scripts.
The following site gives instruction to add -admin to your <tenant>.sharepoint.com url. this will redirect to the admin center. From there the settings are on the left. Which will present a page. At the bottom of the page, navigate to the Classic settings page which will allow for the enabling of custom scripts.
The page says that it can take up to 24 hours for the settings to be enabled. I will update if this fixes the issue.
Hi @totally_gizmo ,
According to my research and testing, I can successfully upload .aspx file to SharePoint using the following Graph API:
PUT https://graph.microsoft.com/v1.0/sites/{site-id}/drive/root:/file.aspx:/content
To help you better, please try to do some troubleshooting:
.aspx file on the SharePoint online UI. 
Here is a similar issue for reference: Cant upload aspx to Sharepoint online / office 365
My test result:
Hope it can help you. Thanks for your understanding.
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If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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Hi @totally_gizmo ,
Do you have any further questions about this thread? If you have any questions or progress, you can contact me in time.
I think there is a misunderstanding. The uploading of the .aspx file at is not a problem with the Graph API. Uploading of the .aspx file into Sites Pages does not work via default. The call from Postman and the error is listed below:
call:
https://graph.microsoft.com/v1.0/drives/<sitePages>/root:/danny.aspx:/content
Error
{
"error": {
"code": "accessDenied",
"message": "Access denied",
"innerError": {
"date": "2023-01-09T14:41:40",
"request-id": "reportID",
"client-request-id": "requestID"
}
}
}
I have had no luck with changing the permissions.
Newly released within Microsoft Graph Beta API, there is the Site Page API that allows for the creation of a .aspx file.
It is a 2 part process.
POST /sites/{site-id}/pages, which returns the newly created site Page.POST /sites/{siteId}/pages/{pageId}/publish
Hi @totally_gizmo,
I'm glad to hear you solve the problem, if you have any issue about SharePoint, you are welcome to raise a ticket in this forum. Thanks for your understanding.