Circles and ... Smaller Circles

Rules Normal sudoku rules apply. Digits along an arrow must sum to the given number in the circle. Digits separated by small circles (dots) must difference by the number in the small circle. The numbers in small circles must be determined by the solvers. Digits in any circles (including dots) indicate number of times the digit show up in all circles (including dots) Links CtC App: https://tinyurl.com/yhmm8nb4 F-puzzles: https://f-puzzles.com/?id=29xw35w9 LMD: https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=000FAU