BI Helper cannot email PDFs greater than 8 MB in size due to the limitations set by the AWS email system. There is no restriction on PDF size - BI Helper will generate PDFs larger than 8 MB, and will make them available in your SFTP location, but they cannot be emailed from BI Helper.
Do not embed SVGs in the email body. SVGs will cause email failure.
A single PDF (from your Power BI report) has to be generated within 45 mins. PDF generation time depends on page timeouts and the number of pages in your report. After 45 minutes, the job token will be revoked by Microsoft causing the PDF generation to fail.
The default PDF process timeout is set at 48 hours for a given job. This limit is customizable.
Empty PDFs: Please check if the page selection matches the page names in your report.
The maximum timeout between pages is set to 180 seconds (for Power BI reports). This limit is defined by Microsoft page timeouts. If your Power BI page does not load in 180 seconds, please review your underlying Power Query and server loading.