I am a blender newbie and I'm trying to animate a storybook opening, a few of the pages turning, and then the book closing. I have the animation keyframed, and I have 2D jpeg illustrations that I have placed on the flipping pages, but when added to the Plane models for the pages the 2D jpegs are being stretched (as seen in the photo). I've viewed a lot of tutorials trying to figure out how to fix this, but without any luck unfortunately. If anyone could please give me some guidance or troubleshoot with me, I would greatly appreciate it. 
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1$\begingroup$ please provide blend file so we can check it out. your image doesn't help us at all. Maybe you didn't apply scale....could be a lot of reasons. $\endgroup$– ChrisNov 5 '21 at 2:28
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$\begingroup$ What is the best way to provide a blender file? I can create a wetransfer link $\endgroup$– bananahaNov 5 '21 at 2:35
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$\begingroup$ open blend-exchange.com and follow instructions $\endgroup$– ChrisNov 5 '21 at 2:53
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$\begingroup$ <img src="https://blend-exchange.com/embedImage.png?bid=DkWzm8xL" /> $\endgroup$– bananahaNov 5 '21 at 4:14
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1$\begingroup$ please do file -> external data -> pack resources, then save and then upload again, so i can see your textures. Thank you. $\endgroup$– ChrisNov 5 '21 at 6:12
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In general you choose quite difficult topic for beginner ...
First problem - wrong UVmap
... fix - "Project from View"
BTW: As you can see your image is different proportion than the page.
Second ... you are stretching page geometry ... your page is not sliding, but is stretch by modifier = it stretching UVmap too.
Tips
For cover I use lovely addon Convert Mesh to Armature ... by one click it generates rig for you (it starts hierarchy from selected face, so select right side before running operator).
For deforming page is usually used animated curve object (animated via shape key) ... this object is used for Page object with Curve modifier.
You can try to rig pages - Armature with bone type Bendy Bones.
You can try Cloth Modifier single page, but that is not your case ... or it works kind of also for more pages ...
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$\begingroup$ Thank you! So what is your suggestion to fix the stretching? Do I need to adjust the image dimensions to fit the page dimensions, or is there a way to simply lock the image onto the page plane without it stretching? $\endgroup$– bananahaNov 6 '21 at 18:47
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$\begingroup$ Main problem is not image proportion, but Simple deform modifier type Stretch you use for deformation ... like I wrote you should use animated Curve object to be used as deformer for page (Page object with Curve modofier). $\endgroup$– vkliduNov 6 '21 at 18:56
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$\begingroup$ Thank you! I was able to figure out a solution with your help! $\endgroup$– bananahaNov 8 '21 at 2:15
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$\begingroup$ If the answer solved your issue consider mark answer as accepted by clicking on check mark under vote arrows so others can easily see Q was answered from Q list. You can undo it any time. $\endgroup$– vkliduNov 8 '21 at 9:31