How to make a pivot table in Google Sheets from multiple sources?

Question

Google Sheets

Good day!
Dear professionals, tell me, please answer the question:
there is a file in Google spreadsheets. The file contains 4 sheets with tables of the same format, but with a different (changes once a week) number of lines.
It is necessary that a table is formed on the summary sheet from all tables on the sheets. That is, the rows of tables (without a header) rose one above the other.
I tried to solve it through importrange - it did not work, because if a new row has appeared in one of the tables, then it does not allow the rest to correctly appear in the summary.

Answer 1

Use range concatenation
={Лист1!A2:C10;Лист2!A2:C10;Лист3!A2:C10}
For your case, allow for empty strings

=FILTER({'1'!A:H;'2'!A:H;'3'!A:H;'4'!A:H};{'1'!A:A;'2'!A:A;'3'!A:A;'4'!A:A}<>"")