Hi @Fubar ,
Sorry for causing the misunderstanding.
Backgroud: I have 2 envs in powerapps, Env1 and Env2. Env1 is sandbox env, Env2 is a free environment for individual use, created through Power Apps Community Plan.
I created a customer portal in Env1 through "Portal from blank". Tables(its old name is Entity) and webpages are configured.
Purpose: I want to copy the entire portal setting to Env2.
Action: Based on your explanation, I created a blank portal in Env2 first. Then using the below schema file to export data from Env1 and import to Env2. Import and export finished normally.

Issue: After import, in Env2 I can't find the same tables (entities) configured in Env1. I originally thought that the import should also include Table setting.
So you mean that to copy Table setting, I need to create a solution in Env1 and added the related tables in the solution, then import the solution into Env2, right?
Actually, I also tried it, but solution import failed with the below error.
Error: "There are no dependencies. Before installing this solution, please install the following solution "Active", "MicrosoftPartnerPipeline (9.2.2009.3)", "FieldService (8.8.0.88)", "msdynce_MarketingPatch (9.0.1904.1019)", "MicrosoftDynamics_Marketing (1.35.1026.0)", "ProjectService (3.10.0.31)", "RelationshipAnalytics (9.0.1.0965)" ".
I don't know if it's because Env2 is a free env created through Power Apps Community Plan, some functions are not complete.