--It seems to be caused by a lot of dSYM files (this area is ambiguous) ――When I looked it up, I thought that was the only workaround to deal with the dSYM file.
Two feelings I investigated
Set debug information format of project file to DWARF
It seems that the setting does not generate dSYM files (probably) But I think it's a little bit that Firebase Crashlytics doesn't generate it because it looks like it's using a dSYM file.
Add config.build_settings ['VALID_ARCHS'] ='arm64' to the podfile
It looks like you don't have to generate an extra architecture dSYM file
If you display the contents of the package of the archived file (.xcarchive) and execute dwarfdump --uuid * under the folder of dSYMs, you can see the list of architectures corresponding to each library as shown below.
The following is the state before inserting the option
dSYMs % dwarfdump --uuid *
UUID: 081C9609-5C30-3CB0-84B7-DF3326EF8146 (arm64) Kingfisher.framework.dSYM/Contents/Resources/DWARF/Kingfisher
UUID: 24163A65-4498-37DB-BEBF-F6227DBFF77C (arm64) Realm.framework.dSYM/Contents/Resources/DWARF/Realm
UUID: 4165D0CD-F99B-36EB-BC2F-8661D5056F33 (arm64) RealmSwift.framework.dSYM/Contents/Resources/DWARF/RealmSwift
UUID: 70DDE517-8A61-3CE3-B1F4-E4B23FBBAD38 (armv7) Rswift.framework.dSYM/Contents/Resources/DWARF/Rswift
UUID: B1138461-D58C-34A9-805C-CAB35DFC9141 (arm64) Rswift.framework.dSYM/Contents/Resources/DWARF/Rswift
UUID: 8A08736F-4BF9-3F50-8A33-B1F2A4A44AAA (arm64) RxCocoa.framework.dSYM/Contents/Resources/DWARF/RxCocoa
UUID: 0EBDB9F9-30C9-3E3C-9C84-B8FFAFF152FE (arm64) RxRelay.framework.dSYM/Contents/Resources/DWARF/RxRelay
UUID: 8EC6ED8C-9989-32F8-88EF-8D4FED75868B (arm64) RxSwift.framework.dSYM/Contents/Resources/DWARF/RxSwift
UUID: 5D9C7297-AE8C-362F-AB92-72926B9243A2 (armv7) SwiftyBeaver.framework.dSYM/Contents/Resources/DWARF/SwiftyBeaver
UUID: DA55A53C-0AB8-35D6-B00B-3BF11D0A060A (arm64) SwiftyBeaver.framework.dSYM/Contents/Resources/DWARF/SwiftyBeaver
The following is the state with options
UUID: 081C9609-5C30-3CB0-84B7-DF3326EF8146 (arm64) Kingfisher.framework.dSYM/Contents/Resources/DWARF/Kingfisher
UUID: 24163A65-4498-37DB-BEBF-F6227DBFF77C (arm64) Realm.framework.dSYM/Contents/Resources/DWARF/Realm
UUID: 4165D0CD-F99B-36EB-BC2F-8661D5056F33 (arm64) RealmSwift.framework.dSYM/Contents/Resources/DWARF/RealmSwift
UUID: B1138461-D58C-34A9-805C-CAB35DFC9141 (arm64) Rswift.framework.dSYM/Contents/Resources/DWARF/Rswift
UUID: 8A08736F-4BF9-3F50-8A33-B1F2A4A44AAA (arm64) RxCocoa.framework.dSYM/Contents/Resources/DWARF/RxCocoa
UUID: 0EBDB9F9-30C9-3E3C-9C84-B8FFAFF152FE (arm64) RxRelay.framework.dSYM/Contents/Resources/DWARF/RxRelay
UUID: 8EC6ED8C-9989-32F8-88EF-8D4FED75868B (arm64) RxSwift.framework.dSYM/Contents/Resources/DWARF/RxSwift
UUID: DA55A53C-0AB8-35D6-B00B-3BF11D0A060A (arm64) SwiftyBeaver.framework.dSYM/Contents/Resources/DWARF/SwiftyBeaver
amrv7 (iPhone5, iPhone5c and below) is not used in the main project, so it is unnecessary.
If you upload it with this, it should be okay.