iOS Build Creation Guide [XCode 12]
a) Select Product --> Archive
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b) Select Distribute App
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c) IMPORTANT Choose the "Development" option
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d) Uncheck all the option and make sure App Thinning is set to None:
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e) Choose "Automatically manage signing"
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f) You will have the IPA ready to be exported. Click on "Export"
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g) Choose the directory you want to export the IPA
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h) Finally you have the IPA ready
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b) Select Distribute App
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c) IMPORTANT Choose the "Development" option

d) Uncheck all the option and make sure App Thinning is set to None:

e) Choose "Automatically manage signing"

f) You will have the IPA ready to be exported. Click on "Export"

g) Choose the directory you want to export the IPA
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h) Finally you have the IPA ready
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Updated on: 11/27/2020
Thank you!