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You can import custom engineering stencils into Visio for the web with Visio Plan 2, but this does not provide the full desktop P&ID functionality. The basic Visio included with Microsoft 365 and Visio Plan 1 do not include custom stencil import.
There are two options:
- For drawing with piping and instrumentation symbols in your browser: With Plan 2, you can import compatible .vssx stencil files containing those shapes. A stencil is a collection of symbols, rather than a complete engineering template.
- For the full P&ID workflow: I recommend the Visio desktop application included with Plan 2. Microsoft documents the Piping and Instrumentation Diagram template there, including smart pipelines, component tagging and equipment reports. Importing symbols into the browser does not add these desktop features. Please refer to this document: Create a P&ID or PFD
Could you confirm your Visio license and whether the files you want to import are .vssx stencils or .vstx templates? This will help me suggest the correct next steps.