@jennyu56228975 @karenlewis @bridgetter54325219 Curious to know what the PDF compatibility settings are. Try exporting with a different compatibility setting. I normally have used the older settings. When I use to work in Pre-press (ad agencies, graphic designers, production houses, would bring their files, and we would make sure their files are good to go and make film negatives for commercial printers). And I was taught to use the older settings. The idea behind the latest Acrobat, newer PDFs may not work in older readers due to unsupported features. So, I have been using an older compatibility setting (e.g., Acrobat 5) for wider compatibility but limited features. It works for me. But, you could try Acrobat 6.0. Try that out.

@karenlewis @creative explorer @bridgetter54325219 @jennyu56228975,
Hi guys,
I was going through the thread and thought of writing down my comments here.
Different Acrobat versions have different compatibility levels for PDFs. For Instance, Acrobat 4 will not support transparency but Acrobat 5 onwards support that.
Again, layers are not supported on Acrobat 5 and below.
There may be a few key factors that show you different results for different files.
The following table compares some of the functionality in PDF files created using the different compatibility settings.
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Acrobat 4.0 (PDF 1.3)
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Acrobat 5.0 (PDF 1.4)
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Acrobat 6.0 (PDF 1.5)
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Acrobat 7.0 (PDF 1.6), and Acrobat 8 and Acrobat 9 (PDF 1.7)
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PDFs can be opened with Acrobat 3.0 and Acrobat Reader 3.0 and later.
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PDFs can be opened with Acrobat 3.0 and Acrobat Reader 3.0 and later. However, features specific to later versions are sometimes lost or not viewable.
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Most PDFs can be opened with Acrobat 4.0 and Acrobat Reader 4.0 and later. However, features specific to later versions are sometimes lost or not viewable.
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Most PDFs can be opened with Acrobat 4.0 and Acrobat Reader 4.0 and later. However, features specific to later versions are sometimes lost or not viewable.
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Cannot contain artwork that uses live transparency effects. Any transparency must be flattened before converting to PDF 1.3.
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Supports the use of live transparency in artwork. (The Acrobat Distiller feature flattens transparency.)
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Supports the use of live transparency in artwork. (The Acrobat Distiller feature flattens transparency.)
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Supports the use of live transparency in artwork. (The Acrobat Distiller feature flattens transparency.)
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Layers are not supported.
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Layers are not supported.
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Preserves layers when creating PDFs from applications that support the generation of layered PDF documents, such as Illustrator CS and later or InDesign CS and later.
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Preserves layers when creating PDFs from applications that support the generation of layered PDF documents, such as Illustrator CS and later or InDesign CS and later.
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DeviceN color space with eight colorants is supported.
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DeviceN color space with eight colorants is supported.
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DeviceN color space with up to 31 colorants
is supported.
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DeviceN color space with up to 31 colorants is supported.
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Multibyte fonts can be embedded. (Distiller converts the fonts when embedding.)
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Multibyte fonts can be embedded.
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Multibyte fonts can be embedded.
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Multibyte fonts can be embedded.
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40‑bit RC4 security supported.
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128‑bit RC4 security supported.
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128‑bit RC4 security supported.
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128‑bit RC4 and 128‑bit AES (Advanced Encryption Standard) security supported.
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I hope this table gives you a better understanding of why using the newer levels of compatibility would be better suited for viewing and working with PDFs.
-Souvik