Regarding the mentioned issues:
1) Only the first page is exported- We had a known issue when the Grid is scrollable and the paperSize is set to A4. Please set the scrollable property of the Grid to false in order to check if this will fix the issue. Also, updating to the latest version may fix it as well, as we fixed some of the combinations of setting which caused the mentioned issue.
2) If all columns are not visible, we can suggest setting a small enough scale value in order to scale the Grid to a point where all column are visible in A4 paperSize dimensions.
3) When the paperSize is set to auto, all of the Grid layouts will be exported. Also, when the template is used, it requires a paperSize to be set(different than auto):
If the issue still occurs, please send a fully runnable example and I will gladly assist.